They fit, they are accurately sighted in for a 6 o'clock sight picture, but they are also taller. Which means that you will have to get used to them. I initiall was shooting about 2 inches high with the TFO's off hand but it only took me about 2 magazines to get used to them. They also allow a bit more gap between the notch and the front sight, which can be either good or bad, depending on how you look at it. Personally, I like the ability to see a bit more of the target around the front sight but that is something you'll have to decide on yourself.
BTW, if you read about the TFO's you'll see they have a tendancy to shed the light pipes. Because of this, I took mine home before having them installed and filled them solid with 30 minute clear Epoxy. Scotch taped the bottom, used a toothpick to feed the epoxy in drop by drop till the sights were full to the top, set them on a level surface and let them set up. Now, mine look like they were molded in place and it had no effect on the brightness that I can see, in daylight they are like a neon sign.
The only thing that I don't like is that they aren't serrated and will produce glare. Which I'll fix at some point by stippling them with an electric engraver and the addition of some flat black paint.