What Valves to get????

I was planning on getting the GC 450s but I have saw a LOT of people complaining about them lately. Sticky problems is the number one complaint. Has anyone haerd of or have the air extremem valves that Krusty's Kustoms has started selling? I was thinking of those valves. I also have had parkers in the past but I want a high pressure valve like the 450s.