+1 to that. I still don't believe how lucky I am to play my VXL more than 6 years already.
IMO, Hartke is a real deal for the price. For me it's "my sound" from years. I own ver.1 (there is a newer ver.2 but the differences are less than minor). First of all I find it has it's thing and could not be for everyone. On the other hand it's really versatile. For me it's always on pedal, both shape and on/off switch. Actually the second one refers to the EQ (bass, treble, bright), the harmonics and level knob. They are controllable in another way, too. You have Mix, sort of blend between Dry and affected by the the EQ signal. If you don't want dirt just put less harmonics or mix.
I'm not sure about that, when the pedal is off it is off, that mean no EQ.
The shape knob is a mid frequencies controller and again IMO it's very important to be used.
Using both switches on at a time gives you a unique sounding preamp!
Don't think you can compare it with GEB-7 - they are different. I haven't played with BOSS, but I have a MXR 10 band in front the VXL, which I use it to reshape the sound from an always on B3K. If I have the right to take just one pedal on a gig or in the studio, it'll be the Hartke. I even plan to buy another one just in case.
Just to clear the situation at it's best, my chain is B3K, MXR 10 band, LS-2( Swollen Pickle in loop A), Hartke VXL, Boss BF-2, Boss CEB-3, Dunlop Volume pedal. I don't use the DI of the Hartke because I use the amp's one.
And at last, you know what, I even struggling a bit from loosing my natural tone adding the B3K. That is why I use the MXR, to try bringing it back after the dirt. Funny how a very pricey stomp box could ruin my "cheep" perfect sound from twice inexpensive one. But these are the rules of the game I suppose.
Cheers!
P.S. And yes, the knobs of the Hartke are real pain in the a$$.