I normally don't buy into these type of accessories but for $24.95 I may give it a try. I'm tired of pinching the palm of my hand when doing reloads on my G19.
I have a habit of stripping the magazine during reloads (and throwing it at the person to my left). That makes it look like it would make it difficult.
I have a G23 and a G35 those would look good on. I like magwells on my Glocks, besides the reloading advantage, they give the pistol a more finished look.
I like mine soley for what it does for my grip. It doesn't have any noticeable advantage when reloading for me, but it forces my hand into a proper grip.