How is Audio Research's Retubing Services?

OK, so I'm thinking of shipping my VT100-MkII to Audio Research to let them retube it(both the input tubes and the output tubes). With shipping, tubes and labor, it's going to cost me close to $1,000. One of the main reasons I want ARC to do the work, is that one, it's guaranteed; and two, when they put new tubes in it I understand they check everything else out. Before I do spend this kind of money (I really do like the amp), I wanted to ask what types of experiances, either good or bad, you've had from letting ARC retube your amplifier.
In advance, thanks for sharing your ARC retubing experiances!