Do a search on google and you'll find some good info on these wheels. I don't think these are very reliable wheels. I think the wheels are made in China with very poor QC. Wheels were initially selling for $400-500 a piece for 20s (I think), but prices dropped drastically as a result of bad feedback from owners of these wheels. I think one of the vendors completely stopped selling the wheels and vendors that still carry these have marked down the price quite a bit to get rid of inventory.
I personally think it's not safe. There have been many bad experiences, but then again there are those that are happy with them.
700 + Shipping is a steal. I personally would not get this brand of wheels, but you can give it a shot.