I purchased the Boss BD-2 overdrive some time ago, and have used in my pedal setup since.
It is one now one of my favourite pedals as I use it together with my volume pedal, and it brings me the original blues sound, I was searching for.
I started out with a multi effects pedal-board, which I now have completely abandoned, as I found it to complex in my set-up, yes the board had many options, and sounds great, but when you are on stage you need simplicity and normally you do not need to select between hundreds of settings.
A few settings are enough and the right combination of pedals, usually does the trick.
And the BD-2 fits just that, simple to use, great sound, and solid build, so it can handle almost any gig.
Best buy of the year for me.