It rules, truly. I have used one for two years. Only reason I sold it was that I wanted a tube-head again (sold the entire rack).
When they came out, they were like $3000. They were state of the art then and all the options still are. It doesn't sound dated either.
Channel 1 is solid state clean, but what a clean. Sounds better than most all-tube amps I played/heared. From warm and dark to trebly with a lot of attack. Almost impossible to distort.
Channel 2 (tubes) is Marshall territory. It can do a really great clean sound, but you can also crank it up till JCM800 territory. Really cool!
Channel 3 (tubes) is all high gain. It rips! Dynamic, very punchy. Great fluid leads or heavy rythem. Very quiet on noise (try the Triaxis on high gain :evil: )
The EQ is very sensitive. You can do alot with it (128 discrete steps to dial in!)
There are many more buttons to push (very handy mid and treble-boosts!) , a lot of effectloop-possibilities, and some handy switch-jacks to control other stuff. All sounds can be stored in 128 presets. It really can act as the brain of your setup to0 (midi-mapper, effectloops, switcher,etc.)
I could have bought a Triaxis at the time, but I liked this one better, really!
If you got any more questions, feel free to mail me.
I've had one for about 2 years now. Many people compare this unit to the Mesa/Boogie Triaxis, but it is actually more programmable and versatile, IMHO. Reviews on Harmony Central give this preamp a 9.4 OVERALL RATING compared to a 9.1 for the Triaxis. The access uses three different internal preamps, CLEAN, TUBE 1 and TUBE 2 using 12AX7 tubes to provide 128 different presets. The CLEAN is warm and glassy, the TUBE 1 preamp gives you a tight Marshall Plexi to JCM 800 like sound and the TUBE 2 preamp offers over-the-top very articulate sustainy/liquid gain very similiar to a Soldano. Each channel allows you to dial in individual patch volume, bass, middle, treble and presence. Each patch can also be programmed for a treble and/or mid boost to push solos and lead parts up front of the mix. Another unique feature is the External Preamp Loop allowing you to connect any additional external preamp to the ACCESS and incorporate it into the ACCESS programs as well as eq it. With the floorboard you can control your whole rack with the access.
I know where there is one for sale if your interested.