If you already have a smartphone, you can add the tablet as a data shared device for a relatively low price if you're with Rogers (and maybe others too).
I am with Rogers, and both my partner and I have iPhone 3Gs's. I have tethered a laptop to my phone before through USB. However, my iPhone no longer works on 3G.
Besides, I anticipate using this tablet on Wifi only, at least for now. I was just surprised, since nothing in the Rogers literature for the deal indicates that the tablet would be anything but a basic Wifi model.
.MKV files are usually HD quality sources, so they do require a lot of processing power, which the tablet might not have for certain clips. I did get some clips off of YouTube in HD though which I did transfer over to the tablet, and they looked great on there... really stunning quality.
I have an el-cheapo 7" tablet ($69 new!) that plays all the hidef .mkv files I have put onto it. That tablet has a microSD slot, so it is much easier and faster to get video, photos, etc onto it. If that tablet can play hidef video, I expect the Galaxy 10.1 to do at least as well.....
Been too busy to play with the Galaxy as much as I would like to. We are in Belleville this week for a dance workshop, so it will be Sunday evening at the earliest before I can get back to it, and we will likely be crashing and recoving by then. Saturday is going to be a very, very long day - we both teach at the workshop, plus we are the event DJs, so we are the first to arrive and the last to leave.....