Word of advice:
-The large combiners are made of utter crappy plastic. I have Raiden and Devastator, and the individual robots look like crap. Combined, they can stand - barely. The real use of them is the combining parts and guns - they can be used with real G1 Tfs. I bought Dev. for 7$, which is about as much as a single Dev combining part would cost...
-The small combiners are great! I mean, they are made of better quality plastic, and they are actually quite tight. I have only Bruticus so far, he's really cool - about 2/3 the size of the real one. There is one problem - they are so tight, you have to be extra careful when transforming them. I heard people break theirs easily. Me, I transformed them a hundred times and they still are in a great shape.
If anyone has any of the mini-combiners, I'd gladly buy them!