Everything you know about BOSS is wrong!
I've tried dozens of other pedals while the OD-3 was just floating out there. I assumed there was nothing special about it, and figured it was just an SD-1 with a new model number and darker color yellow.
Instead, what I found with the OD-3 is an absolute keeper, and arguably the one must-have OD on my board, if I could only keep one. The key buzz words for the OD-3 are "transparency" and "versatility". Much like the SD-1, the OD-3 will let your guitar's original tone shine through. But unlike the SD-1, and many other "Tubescreamer" pedals, the OD-3 retains the low end presence and has some serious output on tap. I've used this thing as almost a "clean boost" with the gain down and volume up, or I've used it as a stand-alone overdrive pedal that can hit rock chords. Trust me, there are very few overdrives that can do both of those things well.
If it were made by a boutique company and cost $200, it'd already be legendary. Lucky for us, though, the OD-3 has been hiding in plain sight since it came about 15 years ago. Even if you don't like other Boss dirt pedals, give this one a test run.