Thanks, Marc! Not to hijack your thread, but I am finding the 5DII to be a fantastic upgrade to the 5DI, especially after having used Lens Align. Here is a brief write-up of my experiences with Lens Align:
. . . I have Lens Align Pro and used it this week-end to calibrate my 24-105mm IS, 70-200mm f4 IS, 28mm f1.8, and 50mm f1.4 lenses. The results are fantastic. Whereas I was getting pretty good results before, now with the lenses properly calibrated, my focusing is much more consistent than with the 5D mark I (my other, previous camera), and the results are, even at 100% magnification about as sharp as with the 5D Mark I (which means that I'm getting a lot more detail with the 5D Mark II, because of the extra pixels).
Before doing the alignment, I watched the video download tutorials a couple of times, and still had a question about how far the lens should be from the target. I shoot landscapes mostly at infinity focus, and also take a lot of images of my 5 year old son, with his friends, around town, and at his soccer games. I didn't want to calibrate the lens for one use and "uncalibrate" it for another use. I resolved the issue of lens to target distance by choosing either (a) 50 times focal length (reportedly Canon's recommendation), or ( as far away as I could get and still see the target at 100% magnification clearly enough to judge what was/was not accurate focus. In practice, it meant that I was calibrating at about 20-50 times focal length. I also decided to calibrate my 24-105mm lens at 50mm because I use the lens most at 24-50mm, and for me the wider end is more important than the longer end of the range.
I had a question about lighting -- I wanted to mimick the type of lighting I use most in real world situations. Since I mostly shoot in daylight or indoors without artificial lighting, I set the target up in my house with no artifical lighting and no directional lighting (i.e. it was all diffuse reflected light) in a relatively bright room.
After doing the calibrations in my house, I then verified each, by taking images of a landscape at infinity focus in daylight with directional (sunlighted) lighting, both with and without the Lens Align adjustment applied. I also verified that the calibrations worked well for both ends of the zoom ranges. The verifications established that the lenses calibrated at relatively close to medium focus distances also resulted in sharper (hence better focus calibrated) images at infinity focus.
Could I have achieved the same results using cheaper methods? Maybe, I don't know. But Lens Align Pro is quick, relatively simple, and works well. It's well worth the price to me, given the significantly sharper, better focused results, and the amount I've already invested in lenses and the camera.
I hope this helps! BTW, my adjustments with Lens Align have been relatively minor, for the most part about +5 or so for each lens. All of my lens were front focusing slightly before being adjusted.