You mean for ProMash? Yeah, I use it every time. it's how I keep track of when something was brewed. It also automatically gives me all my strike temps & amounts, sparge amounts, evap numbers, all that stuff. I use it to automatically update my ingredient inventory, and keep track of when something was bottles, what its FG was, all that. For me, it's half the value of the program.
Sometimes I keep my lappie there if I haven't printed out my session sheets or if I want to amend a recipe on the fly and see what the numbers look like...but normally I just print stuff out. Splashing hot wort on a few sheets of paper is much better than on my $3000 laptop.