Somebody once gave me an Endora cutter from signwarehouse
For some reason, I couldn't get it to cut, so I put it on craigslist. I wound up getting 40 bucks for it. Easy come--easy go, I guess.
Those Q cutters. I think they're Graphtec. I don't know nothing about them, but they claim to track real long. Maybe they're good, if you get them on the cheap. I assume the worst, of the unknown, and if it stops working....throw it out---like a disposable lighter.
I like Summa, Graphtec, and Roland for cutters.