So I bought the Stream 8 instead
Ha! That's what I ended up doing, too. I've got a Thinkpad (Windows 7) and a Lumia 521. I thought of getting the Stream 7, but opted for the Stream 8 because of the cellular chip and free 200/mb of data per month. I don't have a data plan on the phone since I'm around wi-fi 95% of the time, so that free cellular data will come in handy when I'm travelling or waiting someplace without wifi.
I'm not sure what kind of work you'd plan to do on it, but I will say that using the on-screen keyboard with any of the desktop applications isn't the best experience. The keyboard takes up half of the screen, which makes Office apps like Word and Excel really crunched for space, especially if you need to use the ribbon. (I guess this is true for the "Modern" apps, too, but it is more noticeable in the desktop.)
I have a Bluetooth keyboard shipping to me now, which I hope will make it a more usable experience for me to do some light work on.