I own two Merlins and am happy with both. I bought a M140 last year. It's small and light and has great fuel consumption. Now I wish I had waited for the M140XBL. By the way the M140 and Jet Central Cheetah are the same engine internally, designed by Gaspar. The M140XBL has internal solenoids, brushless fuel pump and starter, and upgraded electronics. Plus you get to deal directly with Gaspar.