I bought a 72cc (poor stihl copy) a little while back with the intention of running it to destruction. I thought it would be an easy task, took it out a heap of times, treated it like i hated it, had a special fuel tin for it with a nice 75:1 mix of 91ron and 15W40 diesel engine oil and the bastard is still going. My mate next door is the new owner now, i traded him for a six pack mostly because i was aggravated that it was easier to start than the ms460.
So, if like me, you are planning to buy one of these saws to prove that Chinese gear is worthless junk then you will end up eating one of them nice big fat humble pies like i did, cos the one i bought would have paid for itself 5 times over in firewood sales by now easily and to say the same for a stihl of the same engine size...well... that would be a whole lot of wood...
Just for the record, this was the model i bought.
72CC 24" PROFESSIONAL CHAINSAW CHAIN SAW w e-START | eBay