I have used a CrossBreed SuperTuck for my Glocks and am currently using an Alien Gear for my Shield. For me, they work very well and I can't see any real downsides. The leather is more comfortable against your skin than bare kydex and molds to your side to help with comfort and concealability. True, they cover a large part of your side, but to me, that just helps spread out the weight to help with comfort. While it does get warm and humid here in NE Ohio during the summer, it isn't like Arizona or Florida, so the sweat resistance of kydex isn't really that big of a deal to me. Comfort is more of a concern, and even on those rare occasions that it is wet with sweat, the leather backer is more comfortable than kydex. It is all about preferences and what an individual wants. For me, hybrid holsters work and, for many years now, work well.