I bought the Super Top End for my build. It was a good set, but the engine was not started yet, all I can testify is that it worked well for the assembly.
I took the head off many times, trying to figure out the cam clocking and the MLS gasket held it's own through all the tinkering.
I also checked their pucks against the head and they were thick enough to seal well. There is a thread here about puck thickness, not all pucks are created equal and pucks too thin leak. The puck compression should be - hmm, at least 30%??? - the correct number escapes me now.