After reading all the info, I decided to go with the Race Tuner, for two main reasons. First, the idea of cutting into 100 year anniversary sheet metal to install the tray for the add-on Power Commander for my FatBoy was not an option. Second, the versatility and adjustability for a guy who likes to tinker in Advanced Mode is too much to give up.
But here is a question. I would like to be able to keep a file of my stock 2003 ECM program on the computer, but do not know if it is possible. My car fuel injection programs give you this option, so that you can restore the original program when you go to the dealer for service; no warranty issues that way. This same logic applies to my SERK, plus I would just like to be able to restore it to factory original. Any ideas? Thanks.