I was not suggesting that it is the same DSP implementation as PA systems. I was just saying that the technology is mature so the aspects of it which do work for bass cabs can be run easily and effectively. My experience of DSP implementation from Bergantino has been very positive and my guess is that he would not put out anything which would mess with his reputation. However, I am more than aware that beauty is in the ear of the beholder and the proof of the pudding will be in the gigging. I use a QSC KW112 + KW181 rig now and again. I take it as read that there is significant DSP jiggery-pokery going on inside, I do not feel the need to mess with it. I like what it does purely because I do not have to mess with it.
With regard to the IP struggling with various preamps I actually had the opposite problem. Everything I have tried sounded great, but then when I tried them through other rigs some sounded less great than others.