I've got a Chinese clone of an open port Husky 365. I used a ported AM 77cc jug and modded the carb and muffler. It impresses everyone that tries it. So far so good, it has been cutting wood for around 4-5 years and it has never let me down in the field. The tank vent was crap and I had to mod it, one of the clutch springs broke, the wrist pin bearing was junk and the coil eventually failed, but it still is a workhorse for bucking logs. It's done a heap of work.
A comparable saw in Oz would be over A$2000, the base price was A$230 plus the work I put into it (say A$500 for a strong 77cc saw, spikes, bar and chains). I wouldn't recommend a new saw owner ever get one, but for someone that knows how to set up a saw, it was good value for money. If I ever blow up this thing, I'll just get another one and re-work it. I could do it several times over and still be ahead.
If I was a professional wood cutter and carrying my tool of the trade out in the bush, no way would I use a saw like this - but I'm a firewood hack that pulls the saw out of the truck to cut wood. I'll be using it again tomorrow to cut up a BIG log that should provide me enough firewood for the winter.