Latest review of the Audio Horizons TP 2.3 can be found at 10 Audio.
I use this preamplifier in my system. Like Salevick, I have never regretted my choice. Ozzy's experience is quite different from mine.
http://www.10audio.com/audio_horizons_tp2-3svb.htm
The good news is that I think Joseph may still have an audition program. Perhaps yo can try the preamp and make your own judgement.