That's what I got. Be aware the description refers to two physically different formats: let's call them "large" and "small". "Large" will always work in a large socket, and small will always work in a small socket. Much of the time, small will also work in a large socket, but large will never work in a small socket. You might need pencil and paper :-) Anyway, as you note, it's all cheap enough to make a purchasing mistake. Also, I'm not aware of any ac routers that don't support n as well.
If your notebook is designed like many others, and all these addons are sitting on an internal usb2 bus, then you may not see much benefit from fitting ac cards in the notebooks, other than it being fun, of course.
Edit: I just caught your reference to PCIe Mini card. AC2760 is half mini or M.2 (or NGFF, whatever it's called today). Mini- to half-mini rules still apply as above. ac is still fun to try out because n can't get full throughput in urban settings (roughly speaking).
Last edited by Bushfiva; 2nd October 2015 at 12:31.