Laptops are much more high tech then they used to be.......Before they would only be used on occasion when you were away from your office or place of business. Upon arriving back at your destination you would "dock" your laptop and transfer any work or files that you would have been working on.
I personally work off of my laptops all the time now.....Like the post above stated, it is a little more expensive to get your laptop outfitted to have the same ram etc... as your desktop but it is definately worth doing.
Good Luck!