I hear that. I have saws that I use for firewood, and saws I use on jobs. The old school standard carb saws are for firewood, and when I want maximum efficiency I use the newer stuff. If I have a problem with an mtronic/ AutoTune saw I can't fix on my own, I'd sell it on here with full disclosure as there are plenty of guys who have the ability to work with them, like you do at work(and I probably wouldn't loose any money as I typically buy for a good price used and then make money withvthem on jobs) I just don’t deal with many trees that are real big(not many over 30"), and I don't mill, so the ported 7900 does just fine for my big saw with a 36". I've had a good number of 660, 661, and a couple 395s, they just don't get used enough to keep them around for a 36". If I needed a bigger saw I'd probably go with the 661 or 592, if I wanted to mill I'd probably get a mildly ported or modded 660 for the simplicity, durability, and the side tensioner
.