I think it depends what you want. I understand the Happs has metal rollers, but the Ultimarc's are plastic. The Ultimarc one is made a bit "cheaper", however, I have the Ultmarc one (for 8 months), and I haven't had a single problem with it yet. It might not last as long as the Happs, but then again it doesn't get the same amount of abuse as it would in a real arcade.