I think its just so so, not so cool as i expect, BUT it not yet break down, the quality is ok.
got this for my 6 year old and he had it figured out in about a hour. (falling off about every 5 min) it moves rite along and seems to have power. i rode it around the living room for a min and it didn't break and I'm fat! didn't break! the battery lasts about 2 hours just cruzing the house. its a lot heavier than it looks also id guess its around 25-30 lbs. itself.
Bought two of these for my grandkids. It took them a few hours to get the hang of it, but they did so with no major injuries. Now they glide around like the hover board is an extra appendage. The boards seem well made and are very quiet. The batteries seem to last a long time between charges and seem to recharge reasonably quick with the included charger.