Ive only got Quint - 02, at $80 off ebay, i wasnt too impressed with the size. But the detail is top quality. I would of liked better colours, but the paint job is fine. The battery operated, "floating on lighning" effect needs your imagination to work properly.
I originally wanted to create the judgement scene with hotrod and cup, sharkticons and the quintessons, but I would only snatch the remainding quit-01, quint-03 and quint-04 if they came my way. So Im not exactly hunting them down. Although they are a limited realese I believe
So all in all, I would recommend if you can get it cheap, grab it! But not if they are overpriced.