I have the Tube Channel. I use it constantly and I think it's great depending on the application. When using microphones it does add a tube coloration even when using it on it's cleanest settings. I like the coloration.....the only really clean preamps I've used were from
a 1402 vlz Mackie mixer. I always prefered the ART over the Mackie, so I sold the Mackie because I wasn't using it. The compressor is very logical and easy to use when tracking. The two ratios are fixed so it doesn't give you complete control but I find it will compress or limit either very subtely or extreme if you want it to. I have
a Joe Meek VC3Q and it's compressor is much more extreme than the Tube Channels.
The EQ is very handy especially when tracking synths. I love the way that synths, drum sounds, and amp modelers sound through the thing. It really adds some "life" to them and makes amp modelers a little less digital sounding. They really benefit by going through a couple of tubes. That's the main reason I bought the thing, to run
my Bass POD and Sansamp PSA-1 through it.
It's built well and it seems like a quality product.....it's made out of aluminum. It does generate some heat because it has two tubes in it.
If you want a tube-based processor I definitely think it's worth it. I paid $325 and price was one of the factors for me. I am considering an expensive solid-state preamp in the future so I didn't want to spend too much on this one. The next step up from the Tube Channel is the HHB Radius 40, Mindprint Envoice, or
the ART Pro Channel. There isn't a huge price difference between the Tube Channel and the Pro Channel any more, but the latter is in a whole nother league.