They run circles around the HT's. Speaking from experience here too...
(I have a HT 50cc and 80cc + a Morini 9.4hp 50cc.)
Tell Herm at herdan.com Aydin told you to call, he's a great guy and has equally great prices.
I'll be a Morini distributer soon, but untill then Herm's gotcha covered.
They are built so well (as with most Italian engines, bikes and cars) I'm not gonna lie; I've been a 2 stroke small engine enthusiast for as long as I can remember, and they are truly beautiful motors.
What model are you looking at? I'd go with the S6s, since it's got all the goodies like the digital ignition, 3 shoe clutch, 19mm carb and almost 10HP.
You really wont be dissapointed.
Got some vids on my site if ya want to see it in action...