+1 for the tone press, however, it does colour your tone. Quite a harsh sounding compressor.. You could probably try Cmatmods Comp. or if you're lucky, you could get a used keeley 2 knob for that price..
I like the Demeter quite a bit. Of the optical compressors that I've tried, it is probably my favorite. I'm not really a fan of the Ross style compressors that are more of an effect than the optical compressors.
I agree with this. The blending of uneffected clean tone with the compressed tone seems like a good idea on the Barber, but it seems to me like there may be phase cancellation issues when you blend. The blend seems to thin out the tone a touch and make it more brittle sounding.