I am sorry for posting this on the wrong forum, I have a Surface 2 with Windows RT 8.1, not an SP2. Maybe I should post a new thread on the S2 forum.
I bought the same card, works great out of the box without needing to format! Fast card, very happy. Reads are almost as fast as my Extreme SanDisk card which is great. Writes are slower but still a lot faster than normal cards. The best part however is stability.... the Samsung has worked much better than the SanDisk Extreme which regularly disconnects during usage.