The Verge, a major online desitination for tech information, published a negative review of Surface Pro. The review raises some good points, saying the four hours of battery life is less than half of what you will get on a tablet and less than most ultrabooks and that you won't like to hold it or use it on your lap. I'll know more after I have one in my hands for a week. (I'm picking up my Surface Pro Saturday.) But I am optmiistic and think reviewers are way to critical about issues most people don't care about.
While having more than four hours of battery life would be great, it's not a deal killer for me. The only time I need four hours of battery life straight is when I am flying cross country. And even then I am unlikely to use the device for four hours straight.
I use an iPad and laptop in my house to go from room to room and have a desktop in my office. I'm almost never away from an electrical outlet for more than a few hours. And when I am, I'm in a car, where I can get a charge. Plus, there's already talk od add-on accessories for Surface Pro, like a cover with a battery built in.
So the four-hour battery life on Surface Pro, while not great, is not a deal killer for me or most people.
Also, The Verge says you won't want to hold this device in one hand. I felt that way about iPad, too. So I bought an iPad holder for $20. Problem solved. I'm sure I can find a holder for the Surface Pro.
As far as the device not being good for holding in your lap, you're likely to have the same problem with the iPad. Tablets are a little awkward with no holder. And, when I use a laptop, I almost never try to work with a laptop actually on my lap. I find a table or rest it on a pillow on my legs when I'm in bed.
For advisors, Surface Pro is a big deal because 90% of advisors are using PCs and not Macs. Integration with Windows Office is a huge benefit of Surface Pro. Plus, security--a feature advisors should not compromise on--is better with Surface Pro, which provides full-disk encryption, which eliminates a major legal liability hurdle for advisors using mobile devices.