I have actually only made one printer profile with the ColorMunki (over a year ago), and mainly just use it for monitor calibration, as we have a top of the line professional profiling system, which we use to make custom profiles, as well as any profiles we need in our studio. Without much experience using it for making printer profiles, I'm not fluent with all the details, but know our profiling system uses over 1700 color patches to make a profile, whereas the ColorMunki system uses I believe two sections of up to 50 patches, so I suspect our custom profiles may be more accurate and have a wider range.
I do know that color management with newer Macs and Photoshop versions doesn't correctly print without color management (which is necessary for making an ICC profile), so Adobe came out with a Color Printing Utility. When using Mac 10.6.8 and Photoshop CS5 or higher, you should print targets thru ACPU to be correctly printed without any color management, to get the best profile and output results. I haven't yet updated our color profiling manual to reflect this Mac color management chaos, but have started directing individuals to this information if they contact me about having custom color profiles made. I just posted a new article about the Adobe Color Printer Utility, which you can read here: http://www.inkjetmall.com/tech/content.php?161-Adobe-Color-Printer-Utility
Please let me know if you have questions, or there's anything else I can help you with.
Best regards~ Dana