Every product will have failures, just pick the best reviewed one on newegg. Don't try to find one that has a perfect reliability rating, won't happen.
The best KVMs I have used were from BlackBox but that was for a cost-no object business setups. http://www.blackbox.com/Store/Results.aspx/KVM/n-4294964384/p-0
You probably don't want these, their cables alone cost more than just about any full KVM system. But I've never had one fail on me.