(They restrict PMs to 1,000 words, so this might take a few.)
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I absolutely love them. They are super bright at night with the tritrium, and the fibers really attract the light. I harvested a buck last season right at the break of dawn; had no trouble seeing them. Once I also was in a pitch black street with no lights, and had to draw on a group guys that were looking to "beat the sh*t outta" me, and I could see the dot's glowing like crazy. (Luckily I didn't have to shoot.)
The biggest benefit of the TFOs over the Trijicons is that with the TFOs, the light from the tritrium is sent through the fibers, just as the sunlight. This keeps the dot the same size all the time. With the Trijicons, the vials are in the middle of the dot. With this, you see the big dot during the day, and the small dot in the dark. This means your sight picture changes, which is something I don't want to have to deal with, especially in an intense self-defense situation.