I've been very happy with my SuperTuck, but I don't own a lot of other holsters to compare it with. It is very stable, has good retention, is highly adjustable and therefore quite comfortable. If you blouse your shirt properly, it conceals quite well. It has an unconditional warranty and customer support is absolutely top-notch. It comes with two belt loops and two J-hooks. It's comfortable to wear all day, and reasonably comfortable when sitting down for extended periods (I wear it at my 4 o'clock).
When I received mine, I had to file/sand the sharp edges off the the kydex belt loops and "fatten" them a little (instructions are included on how to soften and adjust kydex) so they wouldn't scrape up my belt. Once I'd done that, I spent a few days trying out various combinations of height and cant adjustments until I found one that was most comfortable. I decided that the loops work much better than the J-hooks for me.
For comparison,the CompTac C-TAC and Minotaur and Tucker Gun Leather's The Answer are similar designs (tuckable IWBs). Tucker's is more expensive, but also comes with "K-hooks." The Minotaur offers the ability to use the same foundation with different guns by swapping out just the kydex portion--useful if you plan to carry different guns at different times.
The only "con"I can think of is that there's no easy way to remove the holster, without removing my belt. Most of the time, this is no factor at all. If I anticipate having to don/remove my holster/gunduring the day (like during a long car trip), I'll use my cheapie nylon clip-on model instead. [ETA: now they come with belt clips instead of loops--problem solved.]
My recommendation: go ahead and plunk your money down. You'll probably love it. If you don't, Crossbreed will take it back.