I went back and reviewed the start of this thread. Looks like the very first DVR+ got into the hands of the very first reviewer (Dave Zatz) four years ago tomorrow. One pleasant surprise to me was that the Internet guide has remained free for the entire time, and apparently will continue for at least a while longer (although the server used by 135R has had a lot of issues; I'm staying on 134R until that mess gets worked out).
A much less pleasant surprise has been the paucity of apps added over that four years. The idea of integrating apps into the guide
seemed like a good one, and CM started us out with just Vudu, but kept promising there would be lots more. Then we got Pandora, YouTube, CMTV (not really an "app," but still), and finally Sling TV in the first two years. But then E* made their deal with Dish, the well ran dry, and we never got any of the apps we really wanted (Netflix, Hulu, Amazon Prime, etc.).
The new Stream+ is likely to change that, if early reports are correct - but I suspect it'll lose the DVR+'s apps-integrated-into-the-guide idea and revert to the traditional desktop/smart phone-style WIMP ("window, icon, menu, pointer") paradigm.
So the DVR+ has had a decent run. But CM has always been terrible about transitioning from one DVR to the next. There's no continuity; each DVR bears little relationship to the last one. If CM sold cell phones, their first might have been a BlackBerry, followed by an iPhone, then an Android, then a Windows phone! (And there's always a "gap" between the last of the old models and the first of the new ones, which always seems to fall during the holidays
) This is a consequence of CM's business model, but it's not the way to build brand loyalty: there's no reason to stick with CM when the time comes to upgrade.