I've had Fitday PC for approximately three years and have used it every day except for a few months that I took off from it. I love it and it's very accurate and easy to use for me.
But as Tammy says, you can't synch it to the online version. It's not even like the online version, at least the last time I looked at the latter.
I used to work at different offices and did not think of doing Tammy's idea of emailing it from one computer to another. I just make a note of what I eat away from my home office (or just remember it) and enter it when I get back. I enter several times a day. I use the goal setting features, exercise log and body log extensively also, as well as the diary and the ability to create custom meals and recipes at the drop of the hat. When I want to delete any of these or edit, that is also easy to do.