Well, you can still run the reservoir dry with the pressure bleed system (knock on carbon fiber, I've yet to do so).
I subscribe to the "I don't want to have to figure out which method is supposedly superior" and I employ both.
I just ran one liter of fresh Motul RBF600 into the system yesterday using both a Motive pressure bleeder and a Vacula vacuum unit. Works like a charm.
I only pressurize the Motive to 10 PSI (though I use 15 on other cars) and when I finish one corner, I move on to the next, set the caliper a bleedin', go back to the recently finished corner, mount up the wheel and so on. Pretty efficient. I run 300ml through each rear caliper and 200ml through each front caliper. By the end you're staring right at the reservoir and you can time the bleed such that you can shut the bleeder screw right as the level "drops" to the maximum mark.
I've bled hundreds of times this way and have only had a problem one time when I sucked the "old" fluid out of the reservoir with the Vacula's suction attachment (a straw essentially) and sucked too much. As a result, I only suck the fluid out of the reservoirs now if it is visibly dirty. Most of the car I bleed are regularly tracked so the fluid is still visibly clean and so I just push it through the system with a like amount of new fluid (i.e. If I put a liter of new in, I end up with a liter of old to bring to the recycler).
KMT, I finally mounted up my Exige scoops yesterday. Props on your bracket design. That's impressive thinking right there! Oh and they look gooooood, especially with the black Cup 240 wheels mounted up too!