In my experience there are so many variables when it comes to touring, you never really know what you're going to sound like night to night. Using an amp you know and trust can help with some of those variables. In the states I generally bring my own rig but abroad I trust back-line to get a good sound that I can enjoy and the band can hear clearly. I'm not sure how endorsement can be seen as a dirty word, I can't think of anything nicer than finding my back line taken care of by a great company with a great product every night. I, of course, wouldn't endorse anything I didn't love.