I've used a Surface and I don't recommend it. It runs a full PC OS, but I found myself wishing I was using a proper laptop most of the time, with a better touchpad and keyboard. You can use it like a tablet, but Windows still lacks great tablet apps (even the apps which do exist for Windows are inferior to iOS and Android versions). Sure, you can run lots of regular Windows PC apps, but that goes back to the first point - I feel much more comfortable doing that on a proper laptop, whether it be Windows or Mac. So it felt like I had this compromise device.
Most of the work I do is on a laptop, and this hardware just didn't work for me - I was noticeably less productive than on a full-sized laptop. As for a tablet, I mostly use it for reading, and this thing is noticeably heavier than my favourite tablet. Overall, it just feels like the idea is interesting but the execution results in too many compromises, like the technology isn't ready yet.
If we could have a tablet as thin and light as the iPad, preferably running iOS or Android with all the touch-based apps, which could then switch into desktop mode when you attach a full-sized keyboard and trackpad, then maybe we'd be onto something.
I guess SurfaceBook had that idea, but the tablet is way too heavy and the battery life sucks and still, the big Windows problem, a poor selection of tablet apps (and again, it's not just about numbers - my biggest gripe with Windows tablet/phone is that when apps do exist, they really lag behind in terms of development and features and so on....ironically, the problem which Apple had for years with PC apps).