Not impressed by this pedal. It is muddy and middy. With drive low it is not a good booster. In general it's got the "stuffed a blanket in your speaker" sound.
Plenty of way better OD pedals out there, but you'll pay much more for them.
Reliability/Durability:
Great, it's Boss.
Ease of Use:
Easy as: volume and drive
Customer Support:
Never needed them.
Overall Rating:
Look elsewhere if you have the funds. If you don't, save up. I suggest one of the following: Xotic BB preamp, Xotic AC plus or AC booster, Ibanez Tubescreamer, Fulltone OCD, or even the T-rex OD pedal. You'll need a tube amp for these pedals of course.