OP is asking for 8.1 experiences because he's satisfied with his vanilla Pro. Basically he's asking "is 8.1 worth it?" specifically for the Pro. But I agree with the above posters that the OP is kinda confusing. He installed on desktop; it's good; not sure about Surface Pro (which is also a full computer).
I'm waiting for 8.1 on my RT and believe the featured improvements (listed in various articles around the 'net, just search) are worth it, but I'm not interested in finding the leaked versions right now and will just wait for the official push since my RT is quite stable and all.