I have a couple of Aliengear holsters. They are reasonable, but the ones I have don't really snap the gun in. The gun presses into place, but unlike many Kydex holsters they don't snap onto the trigger guard.
The retention is fine, it's just different.
The Aliengear tuck holsters have sort of a neoprene surface against your body. It's got enough traction you don't have to wear your belt quite as tight, which is good, but I don't know how well the stitching will last around the edge of the neoprene. I probably shouldn't worry. Mine are holding up.
Aliengear will ship within a few days, and they are a good company to deal with.
My current favorite holster is a Stealthgear tuck holster I have for my compact 1911, but it's probably a little more noticeable (to me) than the Aliengear I have for my P320. It's well concealed and comfortable, but probably not quite as easy to forget it's there.
My fancy leather holsters haven't really broken in like they should. I've about come to the opinion that as much as I like the appearance of a handgun in a leather holster, Kydex or molded plastic is a lot easier to live with. Cheesier, but easier to live with.