I've been using Qbserve for maybe 6 months. It has saved me, I don't know, 4-6 hours a month ret-conning and tuning timesheets. It's also meant I've gotten paid for those trivial jobs that I always forget to enter into even the simplest manual tracker. The productivity boost (which I have absolutely noticed) is a nice bonus. I don't know what you charge for your time, but Qbserve paid for it for me several times over in the first month.
