Mnsaluki I recently heard the Transcendent OTL monos driving a marginal (at best) hi-end system. The sonic characteristic of the amps "transcended" the rest of the system. BTW, it was the FIRST time I have heard an OTL amp. The reason I auditioned was because of what I read and speaking with other owners and Bruce, designer and owner of Transcendent. I have since ordered the stereo version and should have by early next week. Another bonus is if you need more power, Bruce will convert the stereo to mono and you just buy another mono, no charge.
The sonic character you ask? The highs were very clear without any notable brightness, transient edges of the notes were well defined without overhang (I call that speed) and most importantly the soundstage was layered with separation of instruments reminiscent of live music, 3-D staging. All of this was done without electronic arttifacts detracting from musical enjoyment, very effortless and natural. And this is with a mediocre system and set-up. At their price they might be one of the best kept secrets in audio. I'll know for sure soon enough.