I would rather have my students in the air learning how to fly, then sitting in the bleachers because there waiting for their MDS to get back from horizon for the third time! I don't mean to offend anybody but there is nothing to get above or beyond other than having a reliable running engine. Like I have stated in my earlier posts about this engine line, Some run, Some don't!! and the consenses around my neck of the woods from almost everybody, not just myself, is to stay away from them, if you like to fly. On the other hand if your one of those guys that likes to tinker in the pits all day to get your engine to run by all means buy a MDS. Just because I don't recommend them doesn't mean the student will not go out and buy one, it's their choice.