I have the xp4. It's very easy to set up and also easy a snap to clean. No problems with it as of yet. I have only been using it for 2 months. I hear that the parts, if needed are readily available.
The only minor problem that I've run into is that after cleaning the baskets, when I put them back into the canister, they float up on you. You're better off emptying the canister of water before placing the baskets back in and then refill with water.