Since someone else mentioned other brands I have 2 of the latest versions of ASP called the Super series in the 52 size. Fantastic engine in the "next" size up from the 46. Scary power with higher power than my OS 61FX! Regarding Super Tiger, they are anything but super. Difficult to keep running in the air and the throttle bodies tend to suddenly jam!!! Re: MDS, the ones that showed up at our field were soon tossed away after a few hours of fiddling!! [8D]