So... the Glock 2 band has a very deep clear bottom end and a very high high point. I suspect in a Fender style bass it would be amazing, the bottom end would add bass in a really clear way, and the top end sparkle.
But my SS1 already had a really wide sound palette with probably scooped mid and a lot on top already. The Warwick preamp has a high low point and a low high point, so the low adds the bass adds low mid booty, and the highs adds the high mids too. It's frequency points sounds very very Warwick.
What I found with the glock was that it didn't add any low mids (where I was lacking) but added loads of low bass (where I wasn't) - cutting bass just made my streamer anemic, adding bass just made everything too boomy. The top end control cutting was fine, but adding was adding a lot to a already treble bass.
I would think if you are adding it to a fender type sound bass it would be a fantastic preamp... but on my streamer it was a bad fit. If I were advising anyone on a clean/clear preamp though I would find it hard to go beyond John east's uni-pre