I can't speak for all OTL's, but I'm currently using an Atma-sphere S-30, 30watts/ch stero amp driving Alon Lotus SE speakers. It replaces an Audio Reseach amp with a large increase in transparency, imaging and speed. This amp has a wonderful midrange which I preferred over the Cary SET's that I heard. Remember, not all SET's sound the same, Art Audio, Wavelength being more neutral than the Cary's. It really is a matter of personal taste. It is also important to audition the amp with the speakers you plan on using.
Sound of OTL Amps
Trying to get the collective wisdom out there on OTL's. Does OTL's approach the "live sound" better than SET's or the bridged design of the BAT's power amps ? I guess it depends on what aspect of the illusion of live one is looking for. But let's say it was clarity and transparency, which technology is best. Suppose it was the magical midrange - does this mean SETs is automatic winner. For those who own OTL's, why do you prefer these to, say, a 15 Watt SET.