The TM-9100 is a linux box the same as the Open Media but it uses different images and plugins. There is far more support for the open media (basically a dreambox dm500) than there is for the tm9100. Yes it has a hdd option and you can pause live tv, timeshift, etc. and that's a good option if you're looking for that sort of thing. There is also a TM-9100 and a TM-9100 Super; if it's the older version when it can be unstable and reboot for no reason. If you're not bothered about the hard disk option on CI slot, keep the OM, but if you want those things, swap it.