I know there are people out there that will disagree, but I would be very hesitant to put a bias trim pot on either of my Boogies.
If you read Randall Smith's article regarding bias and why their amps are fixed bias, it makes sense. Sure, maybe Mesa wants to sell more of their tubes, but their profit margin is much larger on amps then on tubes, and I don't think they would sacrifice amp sales by making their amps fixed bias, only to sell a few more tubes. Like Randall Smith says "we're in the amp business, not the tube business".
If you have an electronics background and could properly install a trim pot and adjust the bias correctly everytime you changed power tubes, then maybe it's not a bad idea. I own a Dual Rec and a Rectoverb, both of which I love. I am very content with the tones I get out of both and have no desire to add a bias trim pot to either.
One other thing to point out. With a lot of the newer Boogies (RK, Roadster, Stiletto, etc.) that have multi-watt channel assignable power, you can drive the tubes harder in the 50 watt mode vs. 100 or 150 watts if getting more power tube saturation is your deal. It's another option that at least in my opinion, elimnates the need for adjustable bias.