Audio Engineer/Bassist here, huge fan of East products. After installing a Uni-Pre 4 in my Spector I no longer needed a compressor pre Mic pre when recording. I've always used a compressor pre Mic pre, then use a small amount of compression post when needed whenever recording Bass. Uni-Pre and ACG preamps John East makes have instant punch. I'm completely sold, any quality recording needing bass punch your going to do. Your engineer will thank you either while recording or after you sent him your tracks. I don't often do smooth mellow genres so I can't comment too affirmatively, but the man knows where the sweet spots are and how to make them shine. If you haven't bought one and shielded it correctly and recorded with it, do it now. It will change the feel of your entire mix, positively! Whole nother level, Pro Quality and worth it!