Optically they're very good for the money. The focus knob is rather delicate but other than that they're good binoculars. I have the 10x42's but they're only a backup to my Vortex Vipers. I believe they have a one year guarantee- return for any reason for a full refund.
I think they are really good. I picked up a pair of the 8x36 ultra HD's last year for hunting thick timber and just to have a second pair. I've found I like looking through them as much a my leupold 10x42 BX3's.