I've wondered how well those cheap SS bottles will hold up. Some of them look like a direct knock off of the kleen kanteen, right down to the threads and caps - you have to wonder if they are made in the same factory, if the seals are as good, if they are more likely to leak, made from thinner or lower grade steel, etc...
I've always shelled out the extra cash for KK, but I wonder if I've wasted my money.