This one will be short: save your money.
-overpriced (24.99 USD from BBTS)
-one claw broken right out of the package (luckily, I've been able to glue it back)
-flimsy connection on Scrapper in arm mode (the middle "finger" is just jammed between the existing middle claws)
-partsforming (left hand doesn't go anywhere in other modes and you need to detach and reattach the small loader bucket bits)
-alternate transformation suggested by Crazydevy.com (left arm attached by jamming the arm connector through the cage - basically, the arm is now upside-down, and then you attach the hand in what was the shoulder connector) is solid but allows the arm to rotate freely... I prefer to jam the new hand in the cage instead, works much better
-yellow is not a perfect match (very close though)
-rough molding on the loader bucket bits (the "teeth" are much pointier than on the original loader bucket halves)
So, the kit looks alright but doesn't feel alright. Should have been under $10. The worst thing is that the other kit (CDMW-04) gives you ANOTHER left hand that is better and more articulated (plus the wrecking balls). WTF? It automatically makes half of their CDMW-03 obsolete.
My transformation
Their transformation
How the arm is connected
Partsformation
(from there, you can transform to alt mode normally)