Yes, there is a bit of a learning curve. It is (probably) helpful that you have experience in the industry. Another thing going for you is that Xrite offers some free, personal training now with these products. That might help quite a bit.
I don’t think there is a limit to the number of monitors you can profile with ProfileMaker, as long as they are all in the same organization. If that is one of your main concerns, you might consider buying an extra i1 module so you can do your monitor profiling with i1Match instead of PM. It is a lot easier to use as Yann says. On the other hand, the PM monitor calibration offers a few more features than i1Match, as mentioned on other threads. [url]http://one.imports.literateforums.com/t/brightess-at-0-and-still-too-bright-now-what/516/1]
Maybe the best advantage of the PM package over the i1Match versions is the included profile Editor. If you want full control over how your profiles work, the PM editor is quite powerful. In most cases a profile properly made is going to look correct, and you won’t have need for editing - still I have found it useful at times.