PowerTec often seems to have failed in the production of cheap power tools and accessories. No, these aren't the best band saws you can buy, but they are sharp and last long enough for most hobbies. In any case, I'm not too concerned about blade marks from my band saw, since I usually make curved cuts on my disc or spindle sander for finishing. I don't think they are as durable as some of the more expensive brands but they seem to be holding up pretty well. I've used everything from 6 to 24 TPI and have been happy with all of them. As for this easy-to-install feature, it's kind of a loaded question. I gave 5 stars because they are extremely easy to install - on MY bandsaw! I have a Rikon and love everything about it, but setup and alignment is really about the saw, not the blade.