I moved over about 2 weeks ago after about 6 years away from Tivo. I have Roamio Plus with two minis. So far I am loving it. The interface is silky smooth and its wife/kid approved. My install went quickly even with a cabled card and tuning adapter and it all "just works". My wife mentioned that she misses having the commercials chopped out but that a small nit.
These may be features that I just don't know about, but I would have three asks to make my situation perfect....
1) Allow the mini to initiate a pull of video from Tivo Desktop
2) Some easy way to get my videos with DTS or 7.1 transferred to the roamio
3) Remote finders on the mini's