Sharpening my hand saw blade has been on my list of things to do for months.
Granted this wasn't sharpened to the perfect 75 to 80 degrees. By looking at it, I'd wager it to be closer to 50 degree angle. That said though, I wanted it sharpened enough to cut a few smaller tree limbs down and didn't need it to be perfect.
For general use by people looking for a quick and easy sharpening, it's close enough to get the job done. Like I said, I can always go back and re sharpen it later, closer to the correct angle. I just wanted those pesky few limbs down.