When I was first umming and ah-ing about getting into collecting late 2006 / early 2007, I passed on a few, partly because "I can't buy toys at my age...", and partly because they were Classics and Cybertron, and not what I was used to as TFs (G1 kid, here
). I ended up passing on Cyb leader Prime and Metroplex, as well as classics Rodimus and Titaniums G1 Ultra Magnus.
Fortunately, after the the 2007 movie, I found Cyb. leader Prime in a local TRU, and sometime after the initial rush for RotF one of the local shops must have found some older toys rotting in the stock room so I got not only the Metroplex, but also a Cyb. leader Megatron (which I'd decided I "must have" after reading posts on here, I think) to go with them.
Still not got Rodimus or Magnus, though. Probably start looking for them once I'm properly settled into my new flat and actually have somewhere to put them