I've had great luck with them.

The only time I've had problems with either the GMS or the T.H. engines were when I played with the needles prior to starting the engine for the first time. Each time I've started them w/o touching anything, out of the box, they fire right up and after a couple of tanks I can tune them.

I notice that the specs ( as far as you can believe advertizing specifications... ) for the T.H. ( also manufactured by the same company ) .46 rates it at 1.8bHP but the GMS .47 slightly less at about 1.6bHP. Yet when you move up to the T.H. .75 versus the GMS .76, the latter has the higher bHP ratingt.

I wonder why the inconsistency?