Actually, there are plenty of differences, some of them minor like XLR monitor outputs vs. TRS, more insert options, etc. I went for the twintrak because A) I wanted 2 channels for stereo mic setup B) I didn't care about the bells & whistles, just clean mic pres for recording vocals and acoustic guitars. The instrument inputs are good for Keys and my Bass, either straight DI'd or using a SansAmp
BassDriver DI. For electric guitar, when I don't mic
my Carvin Vintage16, I keep a PODxt plugged into the line inputs for monitoring, but record with digital via USB. Both units have a monitoring section with headphone/monitor mix. My Sound Card ( Echo Mia ) outs plug right into the monitor ins on the TT. The monitoring features allowed me to get rid of my mixer completely since I had no more need for the mixer for monitoring or mic pres. I really cleaned up my whole system with this thing. The only outboard rack gear I have now are two RNC's I use on the TwinTrack's inserts.
One thing that's nice about having two channels is that after I sprang for the $250 digital out card I could use the TT as a completely digital outboard compressor for a stereo mix using either the RNC's on the inserts or the built in optical compressors via the stereo link button.
Middleman's right. It gets WARM. Whichever model you get, I'd keep the rack space above it empty!
I'm happy with it, but still experimenting. Bayview Audio had it for $549. The best price I found. They threw in the Cascade VX20 mic and a pop filter. BTW, the VX20 isn't a bad mic at all, has a very nice shock mount and came in a well built case. It compares closely to my AT4033 and, to my ears, sounds better than my MXL V67.
Regards,
Mountaineer