So, after 1 bad experience with Sirio based engines, you will never get them again?....
That you (your sponsor) bought the first Mega ZX engine really surprised me, but indeed it wasn't a reliable product, although I didn't really had to much troubles with it (expect for the flame-out problem).
The Picco P7-R, which was the same, also was of the same quality, Pico, had a bad period....

I've seen you break your 35+ within 12 liters (4 gallons) and you broke many more Nova based engines, way earlier then wanted....

Novarossi has a reliability problem at the moment, but I am sure they will solve this in time....

Like rmdhawaii said it is good that a company carries product to suite different budgets, like Ninja has 2 engine lines now, 1 affordable, and 1 ... less affordable.

The JP 9 ports engine also has problems, like all 9 ports engines have, the liner with these 9 ports in it, is not that strong anymore.
You will propably never see a Picco or Ninja engine break there liner, because they are 7 ports.