This stage is OK, and that's probably it.
The first transformation is pretty good for GW, got a nice platform for Nair-ing through, or for Dthrow -> Dsmash or tech-chasing. You can do D-throw shenanigans on the moving platform as well.
The second transformation is something that I don't really like. People can camp under the platform and it's hard to get at them if they're playing super defensively (which they probably are if they're camping). Take someone campy, say Olimar (since you might be CP-ing him here). If he camps under that platform, good luck. You already have limited options against him. What are you gonna do? Well, you can run up and try to shieldgrab him, but that would be ******** because of his awesome grab range. You can't get at him from his dead angle because the platform is in the way. You're probably going to turtle - and he probably knows it. You could also chill away from him and force him to come to you, but he doesn't have to, and there's no reason why he would or should. This is just one scenario (I play against Olimar often), but I'm sure it could just as easily go for other characters, with perhaps a little less difficulty approaching.
5.5/10 for this level. No reason why you'd CP it, since there's nothing here that really hurts GW, but no reason to ban it (except against ROB). You can gimp recoveries pretty well here, at least, but I can't think of anything else that's in GW's favor.