For £100 I think Apollyon does the job very nicely, the robot mode looks fantastic which is all I needed.
G1 Megatron's transformation will be complex no matter who does it because getting a fairly realistic looking gun into that robot form without the ability to cheat physics leaves designers with few options.
As things stand the only way I'd replace Apollyon is if someone like Fans Toys came along and matched the general look of the robot mode and tweaked the following,
1.The inner leg kibble could possibly be a tad cleaner. As mine stays in robot mode it's not an issue as I just unscrewed the parts and took them off.
2.The face sculpt is generally pretty good, but the eyes aren't that well defined and in some cases has had dodgy paint apps. An improvement to that would be something that could be done. I would also have preferred another face sculpt with a pissed off expression to some of the stuff XTransbots included as they were very episode specific and totally unfamiliar to me.
3.The elbow joints look a bit gappy at certain angles. A relatively minor aesthetic thing, but something that could possibly be improved.
There's also the potential for making more of the thinner parts diecast to improve the durability for people who transform their figures more often as whilst an unavoidable part of the design the amount of thin panels makes the transformation kind of scary.
You've got me looking forward to mine now.