Fulfills what it promises, shuffles right, but it really looks very fragile, you have to be very careful otherwise it will break easy. Uses 4 AA batteries and the middle part where it is to pull the shuffled cards gets loose, could be better adjusted.
The product has no defects, the box was in decent condition.
It requires 4x AA batteries to work. Everything works as expected, shuffles cards decently. for optimal shuffle, I would suggest doing it a few times to a deck that is split in half (each half put on each side of the machine).
Only thing to note is that it does dent the cards from the side (visible in the last image, where the white dots are the dents). For long term use, I would recommend some card sleeves for valuable cards or just use some regular cheap cards without sleeves.
All in all, I am satisfied with the product. It is very useful, as it saves time and helps ease the trouble of shuffling large decks of cards above 100 cards.