Both the regular SimpleTouch and Glowlight version run a modified Android 2.1 underneath the ebook reading software, with a little effort you can root it and install regular Android apps on it.
When I read that the Glowlight had been reduced to £49 in the UK and knowing it ran Android, I had to pick one up and see what I could do with it. So far I have rooted it with NookManager installed an old version of Google Market (the old name for Google Play Store), installed the Kindle app from the market, and a version of the Kobo app that works (the latest version doesn't). It is a bit of work to get a nicely working setup, but if you are willing spend some time on it, you get a eink device that can read ebooks from whoever you want to buy them from. If you want the flexibility, but don't want to put the effort in then go with the tablet. I already have a Nexus 7 tablet myself, but I wanted a dedicated eink reader (I did get a Kobo Mini last year, but broke it and decided my next one had to be one with a built in light.)
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