The Megahouse toy looks best in armor mode. The sculpt and detailing in this mode look pretty nice. The bike mode, however, leaves quite a bit to be desired in my book. The front fairing, shocks, and windscreen are just all wrong. The 'tank' area looks wrong because the fairing isn't deep enough to shroud it, and I'm not too fond of the cage assembly to mount the saddlebags. I'll buy one, but it will probably stay in armor mode.
The Namitoy version looks pretty OK in armor mode, not quite as nice as the MH though. It's a bit bulkier, but that reinforces the sculpt in bike mode. It does look a lot better than the MH in bike mode, with the only really glaring proportional weirdness being the size and shape of the fairing - the windscreen and shocks by contrast look great. Will buy one, and [will try to] remain cautiously optimistic
CMs ride armor is a little bit of an unknown quantity, but the sculpt actually looks pretty decent on the bike... Not quite so much on the rider, from what we've seen. Still, who knows what we're missing, it may look pretty cool finished and painted. As long as there is decent durability, it should actually be pretty cool to fiddle with. At the size, looks like like an excellent replacement for the old Gakken small ride armors.
Until I have these in hand and can make an informed judgement, I'll have to stay with the large Gakken as the best of the best.