I've used the Alpine Soft Loc for a couple of years now. I like it, it has a good deal of vertical adjustment which is nice for those of us with long arrows who want to get the nocks up above the cam. One drawback is the grippers are not adjustable and get loose over time.
I contacted Alpine to see about getting a set of replacement grippers, they were going to cost me almost as much as I could go out and buy a whole new quiver for. In my opinion pretty poor customer service. They also said that they have changed the way they assemble them and the new ones aren't even replaceable.
I'd have to say that as expensive as the Mathews quivers are it's still cheaper to buy a new Alpine quiver every three years or so.