I personally am very fond of my Siege Micromasters, especially since I lost some of my original ones and the replacements fit well into the collection, scale wise.

What annoys me is the difficulty in getting them, some kinds are overstocked and others not stocked enough.
If the Targetmasters count for this, for example, Firebolt is missing from every shelf, but there's still many many Calibursts and Lionizers.

Also, I wish they'd made them in complete sets, either as a four pack or two matched twin packs.
The four pack would be ideal.

The cassettes ones I am not interested in at this time, mostly because they didn't make a Ramhorn and Steeljaw.
Also, I'm uncertain if those ones are compatible with my original G1 Blaster and Soundwave (probably not).