There is a good number of them here....all on 600mm helis and all run great. Match them to the proper muffler, blade size and gearing and they are great. I have a couple that are very high time 20 and 26 gallons of fuel through each respectively.

They do not like too restrictive an exhaust system (I use the Century CN3033A on mine), nore too light a disc loading (loves 600mm blades) or the wrong gear ratio (9:1 or so is great) or any combination there of. A lot of their bad reputation was due to the fact that many where powering up their 30 size Raptors with 550mm blades and the wrong ratios by just popping in the 46. We learned years ago that this does not work. Ditto for the Concept 46 and Ergo 46 that used too small rotor blades to load it properly.