Well, I used mine 'in anger' for the first time today. I've done some home recording through my 'Mids Modded BDI21' and loved the sound, but today I fired it through the big amp (SWR SM400 and Hydrive 4x10) as we had a day's pre production before recording commences tomorrow. Awesome. Nice grind, beefy tone but with a lot more presence in the mix. I play (predominantly) a Jazz bass, so there's already a mid scoop in my sound before it even hits the board, so it really helps to bolster my sound.
Do it - you won't be disappointed. Or maybe asia friendly BCer to do yours for you, it literally takes minutes and makes a helluva difference!