Just got mine yesterday evening and so far I love it.
It tucks nicely tight into the body for superb concealment in the same manner that the Shaggy does but the real trick comes from the foam wedges of different sizes that are sent along with the holster.
As we all know, the lower the holster rides, the more concealable it is but the tougher it gets to obtain a proper grip at the beginning of the draw. On the other hand, the higher it rides, the easier it is to obtain the proper grip but concealment can be compromised, especially if you have a gut that ain't flat (like me). The foam wedges have apparantly solved that problem for me. I have the Keeper at the "higher ride" setting but with the third largest wedge put at the rear bottom of the holster (forcing the gun back towards the gut), my Glocks (17 and 19) just disappear under a light polo shirt.
The kydex is molded tight for my Gen3 Glocks giving it better retention than my other rigs and frankly I like that. It is a tad slower at the draw right now but 1) I just have to practice more for this to smooth out and 2) I'm no competitor interested in pure speed so I'm not really bothered.
I'm wearing it near 2 o'clock which is generally my preferred position and it is in no way uncomfortable in any position one might find oneself in daily life; I even tried some kicks (just to prove that stupid video wrong; if I have to kick, I prefer low line ones) and again, no problems at all.
This an extremely ingenious design that is also extremely simple to make work for yourself.
Highly recommended!