They're absolutely worth the buy. I've put these things through the wringer and have kept up with my snap ons no problem. Only partial issue is the stamping for the socket size is somewhat faint but it's pressed in the socket too so no big deal.
Nice case, complete set, good for regular and impact use. Just completed replacing the sub-frame on a 1996 subaru taking some pretty tight, rusted bolts off with a 40 inch breaker bar. The sockets held up just fine, no problems.