I've had 3 laptops in all - first one about 10 years ago. They have good and bad points IME...
Plus -
Can do your work anywhere you can set up and feel safe
Great for keeping in touch with the world when away from home
If you go wireless, you can work sitting in the garden on nice days
Don't take up the space of a desktop - can be put away when not in use and (technically) locked away more easily
Briiliant for student daughter (though security in student digs is an issue)
Minus
Can do your work anywhere (bye bye work-life balance if not careful)
Harder to upgrade than a desktop (can't change screen size without plugging in an external monitor for instance, and I like a really big screen)
Parts (IME) more expensive than a desktop
If something breaks under warrantly, you generally have to send the whole machine back rather than the failed part (has happened 3 times to me)
IME, more fragile than a desktop, esp the hinges and dvd drives
Again, IME, better specced desktops were cheaper than similar specced laptops
If using for any length of time, I find laptop keyboards less ergonomic than desktops