rfiesen i cant say much about thatsdax but as you already know, HT kits are way below par as compared to the morini engines. the GOOD thing is, all the HT running gear is compatible with the morini engine (aside from the engine mounts)
so if your mechanically inclined, and dont beat the supreme piss out of things and value your purchases you should get at least your moneys worth out of the HT 80's and upgrade in a year or so?!
id love to use a morini engine in a MB but, truth be told im starting to weight my options on motored biking. to me its transportation. im totally done with frame mounted MB's
the HT is a great little hobby engine if you ask me, but be prepared to look them all over and ask alot of questions. you really should replace all the hardware right off the hop with loctited, torqued, grade 8 stuff (or stainless steel) and check the fit of the intake and exhaust parts as well as bolt tightness.
have fun broja!