I ordered this piece at almost $500.00. I ordered the one's with the ball feet and received the one's with the caster wheel's. I didn't notice it till I had already finished building the island. And that ended up working ok, I'm able to access the storage much better with it on wheels. 
The wood is NOT the best quality, and at the price it should be better quality. It's decent. I hope it lasts at least 5 years..............
The marble top is very heavy. You can't lift that on your own. It's beautiful, but for the price, it needs to be better quality I think.