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Spot Hogg. I've owned lots of sights and the machining, fit and finish, durability, and adjustability of the spot hoggs is the best IMO. Tru-balls axcel sights are close but thier pin brightness isn't as good to me, so I put the hoggs above them. I can see my Spot Hogg pins from before legal light to after, and once you get used to the pin adjustment they are the most adjustable, solid pins out there. Once set, they will not move. Plus they have the aiming wire running down the center to aim with while shooting between pins, and to line your pins up with, which is nice. The fibers are fully contained as well. The only thing I think spot Hogg could improve is the level. A slightly bigger, yellow level would be a great addition to them.
Black Gold has the best customer service I have ever experienced. They just sent me a brand new replacement. They have my business for life!