In my final year of university now. started with an SP3, then got an S3 because I had a grant at the uni book shop and it was the only thing worth buying, and then got an SP4 on launch. I have to say it has been phenomenal.
The pen+onenote have really revolutionized my method of learning, and classmates have gone out and bought one variant or another purely from seeing me turn up every day with nothing but a tablet in my bag yet every piece of work or lecture and notes that we've ever done. I've not had to use a piece of paper in over 2 years, while they're still spending significant money over the course of the years printing out reams of lecture slides etc.
Regarding the keyboard though, I've used mine for every single assignment (business management and psychology, requires a LOT of typing), and I love it. I in no way feel cramped, or that it is an inferior experience, or requires adjusting to. To me it is no different to any other laptop keyboard. I've got ergonomic and mechanical keyboards etc, they all stay with my parents because I don't see a need for them. But remember, once home and doing assignments, there is no reason you can't just plug in your keyboard of choice.
If you can afford it, buy it. That's the best advice I can give
Best get back to writing up my dissertation on my typecover
I'll try and keep an eye on this thread should you have any other questions regarding a surface in a school setting.