Boss SD-1 Super Overdrive - This classic overdrive has been in the Boss lineup since the early days and continues to impress players everywhere. This SD-1's realistic crunch and aggressive bite sounds like a meaner Tube Screamer yet still maintains sonic stability while strumming through complex chords or busting out double note work. The best thing about theSuper Overdrive is the wide range of drive adjustment. Cranked to the absolute limit, this will take you to the edge of tube-like disintegration but also rolls off to give you nothing but a clean boost. You can't get much more versatile than that in our overdriven minds. We've sampled the earlier models of the SD-1 and haven't noticed a bit of difference between them and the newer models. With all the fancy fuss over boutique overdrives these days, it's nice to know you can pick up a pedal for under $50.00 and get down to business.