In my job I travel a lot across Europe, so have a little HD and wifi hub set-up which I use to carry some movies and TV programmes on to keep me away from local TV and somewhere near sane. Usually I take my old netbook with me (with HDMI output) and play them onto the hotel TV via that, but I'm very much in the market for an alternative solution where I can just take the hub/HD, plus my Nexus7 and HTC 8X and use one of those to send the media to the TV (the hub has SMB support, and apparently is soon to get DLNA via a firmware update, also probably around April-ish).
So I've been looking at both Chromecast (not in the UK yet), some of the cheap Chinese DLNA/HDMI dongles (cheapest I've seen is ~£20 inc P&P), the Android-on-a-stick's (which I'm not keen on as I don't want to need a bluetooth keyboard/mouse) and now Roku have added this to the mix.
I'd be interested to know of others experiences doing something like that. Current front-runner I think is the cheap Chinese job, as I don't really need iPlayer/Netflix (said hotels are usually abroad which would kill off live iPlayer, and their wifi speeds would kill Netflix et al) so just looking for something to act as the receiver for the locally-sourced files (mostly MP4).