Love It...
Just wanted to chime in here. I haven't used my timberline for a while now, but that's only because I haven't started bucking firewood yet (next years wood that is, been too busy). BUT...it's nice to know that when I do start cutting again, I've got about 12 freshly timberline sharpened chains to use. I used it to "revive" a bunch of old chains that were hanging around, some good ones and some mutilated ones. Granted, only 6 or 8 of those chains would I even think to take in and have a "Pro" sharpen. But at $15+ per chain, I got my money back already. Oh yeah, 2 of those chains were for a 36" bar.
As compared to hand filing?? If you are good at hand filing then you will be faster...but don't take too much time or I will be faster with the TL. Once you get in a rhythm the Timberline is not what I would call slow.
However, unless you are really good with a hand file, odds are the timberline will show you your shortcomings. I thought I was decent at hand filing, and so did my old man, until I got the Timberline. Our older chains had some serious issues, cutter lengths and angles were all over the place.
Is the Timberline perfect? Probably not...
Can I tell the difference?? Nope...
Just my $.02.