The Surface Pro is definitely mobile, but everything else about it I don't like. It seems a lot of laptop manufacturers are taking their sweet time getting models with Haswell CPUs rolled out. Oh, and it absolutely can't have a touchscreen.
I get to use a surface pro in the office at work. Its horrible. Its neither a laptop, nor a tablet. Its a steaming turd.
Its really heavy. It weighs a frickin' ton. About 4 iPads.
The keyboard is shocking. If you take the keyboard off and use the tablet keyboard ... OMG you are stuffed.
I don't know about you, but I type on a tablet using one finger. MS for some un-Godly reason thought it would be genius to split the keyboard in half. This is not intuitive. In fact, its bloody madness.
It doesn't really do sharing which is an easy way to transfer files etc on a tablet. This makes it clumsy and annoying.
Its actually not that fast. Apps are optimised for arm processors and tend to run quick. Surface isn't giving you any improvement. In fact because its cocking about with anti-virus and other windows drivers and services, its slower to do a lot of things.
The surface also thinks its a laptop with a 1920x1080 screen. So everything is tiny. You can't read anything and pinch to zoom isn't as native as it is to proper tablets. Often it won't zoom and your finger is too big to select the tiny hyperlink or button you want from amongst others nearby.
My favourite is iPad. I just wouldn't buy anything else.
I have been surprised how good the Kindle HD fire is. I'd buy one if on a budget.
I also have to use the Nexus 10 in the office. Its the fastest tablet there is. I'd understand anyone wanting one. I just don't love it.
But get any of those before you buy a surface pro. If you want a laptop, get a laptop. A surface pro will ruin your life.