I'm hoping to get some advice...I can't decide which one to buy. I've already test drove an derestricted Dervi Revolution GS moped and I was amazed with the quick accerlation (used to own a Tomos Targa LX that goes 40-45 mph). My local dealer carries this moped for $1900 and I know a new ZUma is $2000. From what I could tell the Zuma has better brakes (disc) and the Derbi only had a 120 mm drum brake (more responsive that my Tomos...No trouble stopping when riding 40 mph)...I just don't want to end up spending some much money upgrading the moped or scooter and later realize that it sucks (like my Tomos..). The suspensions on both models are pretty much the same...I love the handling on my Tomos, but I just hate the slow accerlation and the engine performance. Anyways, any help would be greatly app.