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If you're close enough to their facility to stop and check it out, I'd recommend it. Impressive facility and everyone was quite nice and happy to show you all their wares.
Picked the car up today. Got the airbox and tune, downpipes to come. Initial impression after driving it about an hour home, you don't notice a dramatic difference on the highway, but the car was quite capable there already once you get all that mass moving. From stops and lower speed hard accelerations though, whoa. Pretty significant difference, throttle is much more responsive and the lag is decreased pretty considerably. The turbo sound is more pronounced if you're listening for it but if you're not you'd still not notice it.
Gear changes are...different. I'm not sure how to describe it other than slightly smoother and without the weird clunk that always seemed to accompany it before. All in all I'm quite happy so far. I didn't get a before and after dyno because I was just going to drive down and get the tune and then do the airbox install myself but ended up changing my mind after they already had the ECU out and essentially finished. When I go back for downpipes I'll do a before and after.
As a side note, and I know I mentioned it above, the people and facility are awesome. Hartmut himself gave me a tour of everything and you can tell the guy still has the passion for cars in him. He really does care about their products and is heavily involved in all aspects. I was impressed.
Here's one more pic, hope to get some numbers and a video or two up soon as well.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
