One of my greatest fears is replacing something on my brew system because I know something is going to leak when I am done. It's just Murphy's Law. I recently replaced all of my economy ball valves on my system with
these. They are much easier to take apart and clean than 3-piece ball valves and they don't leak.
On another note, I performed an autopsy on my economy ball valves after replacing them and they were disgusting inside. It kind of grossed me out.
Bald guys rule.