I have used Tox for some years now. I never have used Sure lock so I can't compare, but I am VERY pleased with TOX. Tough, durable sights with great fitting componets. If you do have a problem, pick up the phone and call them and they will take care of you.
For fita look at the I think it's the tox 3600, the longer travel one. I have the nail driver light and found it to be a bit short for what I needed for FITA. I managed to get it to work but had to do some adjustments with the rest and speed the bow up to get all I could out of the sight. I had sureloc's,liked them but they are not as bullet proof as the tox IMHO. The naildriver is great for 3d's, it locks tight as a clamp and has positive clicks. If you get the sureloc, save your money and buy the challenger. It weighs more, but is a little more beefy to take some abuse. Matt
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