Just thought I would interject back to the beginning of this topic. I own and use the V-amp Pro for studio sessions and I used to use it live. I stopped using it after about 6 months because it seemed to kill the tone of my amp. Do not let this deter you however if you are interested in purchasing the unit. First off a word on quality. I have owned three behringer products in my life and all three are in perfect working order and have not been treated well. They are very rugged and dependable units. I'm not saying that your will be. The three products I have owned have performed flawlessly. Now back to tone. I think we are all in agreement that there is no processor or piece of modeling gear that will produce as good of a tone as its original piece. That being said, I play a GK 800RB and I am absolutely in love with its tone. I stopped using the behringer live because it muddied my amps tone. Now, I have used the V-amp with a power amp (a crown xls 402) and it sounded incredible. In the studio, it sounds incredible. So if you have an amp that has a signature sound that you love, you don't really need this, because it does muddy the tone a bit. I should say it changes the tone, not muddy. For me, it wasn't a bad tone, just not the tone i wanted, and there is an amp model for the 800RB but it just didn't sound right. So if your building a preamp/power amp rig or need a good DI for stage/studio, this is for you.