Brian is right on the ball here in that the Pitpro is a great bike for the price, HOWEVER
I own a Pitpro 140cc and an MSO Pro (140cc) and the MSO feels much smoother to ride in all aspects and the overall build quality is miles ahead. The carby is a 25mm Mikuni which runs beautifully while the Pitpro uses a "30mm" (26mm) Mikuni which came badly out of tune from the factory. The suspension on the Pro laughs in the face of the Pitpro. It's a bit unfair to compare the two bikes considering the Pro is almost double the price, something which a lot of people cannot seem to justify for themselves, but for anyone tossing up between the two brands and has a budget which allows for the MSO, there's no question about it, MSO all the way!
Another great thing about MSO which has been brought up time and time again is their service. Every time I speak with Ken and Linda I receive very informative responses and a genuine sense that they care. In comparison, upon emailing Pitpro about incorrect tube installment and lack of spoke tape on the rim which resulted in a completely shredded rear tube, I didn't even get a reply. Surely Brian at Maylands wouldn't let that something like that go unnoticed but I believe that MSO's service is unbeatable.