I have been working with one for about a month. So far it's been great overall but it took a while to get used to having my wrist limited in its movement at first. The glove is a little painful at first if worn properly and it can be awkward.
Like all training, when you first try to change something it's very difficult and you tend to miss a bit while you get used to a new method. I would miss some simple shots that I must have been making before by adding a little backhand twist. Without being able to move my wrist like that anymore obviously I wouldn't be able to make some shots but my position play improved quite a bit.
I haven't finished testing the glove but I can say I'm back up to being an A again after taking almost a decade off playing pool. I'd like to try it for another month or so before I could give an honest assessment of how much it has changed my game.