I would say any Fansproject is definitely worth the price if you can get it at the original price. So if you can get Warbot Defender (Springer) and the Crossfire 02 (Bruticus) sets, not to mention City Commander and the G3 Trailer go for it. But one that is long sold out, Crossfire 01 (Superion) goes for MUCH higher than the original cost. I have it, but I wouldn't say it's worth going out there and spending $100 on. It was originally half that, and that was slightly pricy for what you get, but worth it. But not $100. The rest are definitely worth the costs providing you don't pay inflated eBay prices. I don't regret buying any of them. High-quality, superb design, great concepts...there's everything to love about Fansproject.
There's also TFC, which stands for TFClub I believe, but has no affiliation with anything offical from Hasbro or Takara. So far they have produced weapon add-on kits, notably for Classics and ROTF/MP/Classics/Alternity Prime. The former is some interchangeable missiles for some of the Classics deluxe cars, a ladder for Inferno, an Autoscout accessory which is compatible with G1 Soundwave, and a weird 'hologram' box thingy which simulates Mirage's disappearing ability. I got it as a gift, and while there are some QC issues with the launchers (they jam), I would say it's nice if you want some extra weapons and can get it for under $40 or $50. The ladder is especially worth it. The latter add-on kit is a light-up LED gun with modular parts which is usable with all the modern versions of Prime I listed above. Very cool. Definitely worth it if you want to give your ROTF Prime a gun. I believe I paid about $35 for it. The quality seems higher than the previous release too. They also produce the MP Rollar accessory, the transforming Roller which is also compatible with different versions of Prime. I don't own it as the style doesn't appeal to me, but it looks decent quality-wise.
Then there's BTS Toy who have made a Classics-style trailer for various color schemes of Classics Prime, and an additional add-on for that trailer, as well as a recent add-on for G1 Prime. I own the first two, which also come with extra hand-held weapons for classics figures. While I really enjoy the great design, the build quality leaves something to be desired. They use lower quality plastic which is definitely noticeable. That said, the paint jobs are actually great. The prices do reflect the quality, I feel, as you could probably pick up the trailer for around $50, which is quite a bit less than Fansproject's. I would say get the BTS trailer if you really love the design, otherwise go Fansproject.
I don't even remember who made them, but I also own the MP Starscream & Grimlock add-on kits. Starscream's is cool and cheap to pick up. The cape could look better, but the crown and shoulder armor is worth it for sure. Grimlock's is useless if you have the US release because the only accessory that's worth it is the crown. The build quality is decent on both of these, and they're cheap.
JustiToys produces fairly high-quality WST versions of G1 figures. They're behind the WST Dinobots, Shockwave & Blaster. All worth it, IMO, although I think the Dinobots are becoming hard to find.
Heerotoysmaker was mentioned above, and he only sells through eBay, but if you want other WSTs they're worth it too. I have some of the seekers and the Magnus. The plastic isn't as high-quality as the real things, but Takara never did produce a Magnus trailer. Go for it, you won't regret it. If he has a new product in the future though, don't rush to buy it. The first few will sell for ridiculous amounts. A few weeks later you could pick it up for $25.
Impossible Toys kind of let me down with their Valkyrie (Arcee) figure. The design looks good, but the QC is terrible. Some had sloppy or missing paint apps, the figure doesn't peg together like it should, and mine even fell apart. Not worth what I paid for it, sadly. The one iGear is offering looks much better, but too expensive for my taste.
I can't comment on the rest of the 3rd Party companies' products as I don't own any others, but I do have to say I am avoiding CrazyDevy like the plague, and I'm very wary of iGear.
CrazyDevy is ridiculously overpriced, I hate their marketing tactics, and they seem to have released their Predaking wings without actually testing it...they cause damage to the figure when you install them.
iGear is making blatant KOs of Masterpiece figures and seems to be taking ideas from customizers and not crediting them. However, they do also distribute items for other producers, such as the aforementioned Arcee. I've also heard the QC for their Faith Leader (MP KO) figures is not very good, the clear versions being particularly atrocious. They're also far too expensive in my opinion.
There's one last company I haven't mentioned, and it's Perfect Effect. They've made the recent Rumble/Frenzy figures which are repaints of their Shadow Warrior, which was actually designed to be an add-on for Fansproject's Shadow Commander set. Their designs interest me a lot. I have heard of some mis-assembly issues and a few sloppy paint apps, but these seem to be fairly random, and they're supposedly generally good. The one thing holding me back from buying their products is price. I would definitely jump on the Rumble/Frenzy pack if it was under $40, but at the actual price of around $60 I just can't justify it. They're tiny figures. But they look really cool if you have the money, and all of Perfect Effect's designs look very promising to me.
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