I'll list some of the more important:
o Probably counts against your broadband bandwidth cap-do not have a data cap since we live in a Charter area
o DVR solutions are all over the map in terms of usability and usefulness and you may need different solutions for different content- DVR for VUE has been perfect for us, I have heard it works very well for YTTV also.
o Often involve multiple receivers on each TV (can be a complex issue for the DVR situation) with the attendant switching between sources-why would we need multiple receivers, even if we had different services, say Philo and Vue we would still just need the Roku.
o May involve subscriptions to multiple providers (perhaps including a separate DVR service subscription)-again Vue suits our needs and does not charge for the DVR, but even if OTT charges for the DVR what is so different from Sat./Cable services, it is not like they give away their DVR for free.
o Certain classes of content (especially live sports and events) may be difficult or relatively expensive to get- Core from Vue includes all the ESPNs, FS 1 and 2, MLB Network, Big Ten Network, CBS Sports Network, NBA TV, NBCSN, NFL Network plus it has my local sports network and does not charge us extra unlike Comcast and example for example.
There are others, but these are the ones that I think prospective cord-cutters must consider.
Overlooking the big picture of User Experience is a huge folly if you have some less tech-savvy viewers.- my wife has early onset dementia because of Parkinson’s and she has always been techno shy and figured it out, hit the app and push a button for guide, easy.