I mentioned in your other post (before seeing this one) that I bought one of these and have it set up for 9mm bullet sizing. It works well, but really needs a bullet feeder to take full advantage of it's efficiency. Sizing is very fast, but once I stop to fill the feed tube again, I think it ends up about the same speed as just using the Lee push-through sizer dies in an O-frame press.
They are a neat idea though and I hope Lee eventually develops a bullet feeder for it; I'd buy one.
Be aware - I bought the "Deluxe kit", but still had to buy a separate "bullet sizing kit" along with the specific sizing die I needed. The APP sizing dies are different than the push-through dies that fit a normal press; they are more like a bushing that fits inside the bullet sizing adapter.