The OS 25FX is a bit more, but worth it considering there is alot less fussing with it. They run good out of the box and don't require the "prep" that the Magnums do... The Norvel's are VERY light and put out alot of power, but some have more troubles that others getting them to run reliably. I have a couple of Norvels, and I'm real happy with the performance and they haven't given me any problems.