Good reissues:

Pipes.
Outback.
Gears.
Huffer.
Powerglide.
Ratchet.
Sky Lynx.
Targetmaster Kup.
Sixshot.
Megatron.
Ultra Magnus.

Bad reissues:

Optimus Prime, Meister/Jazz and most of the other toys they feel the need to reissue every year. New (old) moulds please!