Magmatron is definitely worthy purchase. So is Big Convoy if you can get him.
I love Magmatron, I'm so glad I have him, in fact...the only Beast Wars figure in my collection. (So that should tell you something.)
There's a robot mode, a Super Beast mode, and then the individual Dinosaurs.
The transformation is nothing like you'd expect, it's quite intricate and considering how he's constructed...he holds together solidly. His weapons system is neat, it serves as a gun and a sword, and yes...it fires.
The wings on the "Skysaur" (as it's called) actually flap when you pull the tail.
The neck on the "Seasaur" (yes, it's called that...) is fully posable and ball jointed. (A tad long though. I yanked some of the links out of the neck on mine so it wasn't so long...)
The "Landsaur" (no, I've no idea who came up with these names, but it's sad...) is probably the least functional of the three on it's own, it pretty much just stands there, but it looks cool.
Definitely worth a purchase, if you can find one and it's cheap enough, get 'im.
NOTE: Realize that I am not a perfect Christian, nor do I profess to be. I apologize if anyone's ever offended by me, I'm not perfect. Don't hold my posts and opinions against other Christians.