I have 1/4, 3/8, and 1/2 drive SK chromes socket sets. They have served me well. I have had a few issues over the years with the inside finish not being as smooth as I thought it should be on a few sockets, the detent ball cutout too small to be of any use, and varying depths of usable lengths in some of their deep sockets. SK produces a great mid price tool that really is a less expensive option than a tool truck. Don't get me wrong, ther is a wide price gap between some online vendors, stores, and independant tool trucks. The good thing about is SK is you can augment socket sizes you need that may not be offered by Craftsman without breaking the bank. They may not be that easy to warranty but, if they don't break in the first place warranty service may not be a big issue.
I personally think that every tool company out there is facing challenges and taking whatever steps it can to reduce costs in today's troubled economy. Is this affecting quality? I'm sure it is. In addition to supplying tools for Sears (with or without the Craftsman name), SK also supplies alot of tools to the US government and competes fiercely with Danaher for these government contracts. No one tool brand offers everything I like to use. I grew up on SK tools as a kid. I'll continue to stick with them until one of us folds.