The Sansamp has no compressor but the signal is surprisingly balanced, recording studios seem to like when I bring a BDDI with me. It's horrible for a live situation but it sits really well when you record through it.
The SansAmps have no compressor control knob, but the SansAmp circuitry does perform compression. At low settings, compression is about all the Drive knob does (that I can hear).
Tech21 guy said so in another thread.