My issue weapon has a bit of a flare, but I am not a fan of adding a mag well to the gun. Some work reasonably well, but most make it harder to pull a stuck mag out. Most make it harder to conceal (for those of us who either have to or want to). Magwell's don't make your reload faster, though they can reduce the number of fumbles a user experiences. They can also increase the number of fumbles, when you don't understand how to use them. They address an exceptionally small part of an exceptionally rare event, and they do so with mixed results, while adding a failure point to the gun. Not worth it, imo.
Frankly, it is mostly an attempt to buy skill. I get it, as we can't all train as much as we would like, but this area just isn't important enough for the drawbacks to be worth it. Now a built in magwell, that address the issues above, can be an advantage, but for the less skilled, it really is probably a wash. This is proven to me on a weekly basis, but ymmv.