I'm all for discussion of the IC-7100 here if such discussion pertains to comparisons with the IC-7000 which is this group's focus.
From the info given the IC-7100 may not be my choice. I don't have a 7000 yet, have been planning to buy one when finances permit. I use an IC-706MkIig which I have owned for 11 years.
The main things dissuading me from the 7100 would be: non-attached control head, no color display, and no external display.
As for D-Star, I'm still undecided. I live in the Los Angeles area and there is quite a bit of D-Star activity here but I'm still not sure if I want to commit myself to what only one brand supports.
The 7000 was out quite a while though before the 706 was finally discontinued. AES and others had special close-out prices on the last of their inventory. Not sure how soon that might happen with the 7000 but it would be good to know about if it does.