I'm a Flash developer, using the fully-leaded version of Flash.
To answer your question, there doesn't seem to be much in it, in terms of functionality. And I note that the ads all offer upgrades one way or another to the Max2 option, which seems "ok" for £100. (Full Flash is ~7 times this). Perhaps they're trying to lever their customers into this version?
As to the effects on offer - do we want them all over "our" Mayhem?!

Andy