I've had a P-Solo for a few months now, and think it's a nice pre - certainly and noticably better than anything else I've used for home recording including the DMP3, VTB-1, Yamaha mixer pre's, and various interface pre's. I chose it over the Presonus Eureka, MP20 and I'm confident I made a solid choice.
It's a clean, detailed pre that IMO is NOT sterile by any means. I've used it with my Groove Tubes GT50, CAD M177, and an SM57. Also did some test's using the DI and was very pleased with what I heard. If you're looking for something that will and color, character or whatever you'd choose to call it, this pre will just give you a clean signal - no frills and it's got nice gain.