I’ve been using RowPro (currently v4.000 on a Win7 laptop) for >5yrs, I reckon it’s worth the money.
Interface isn’t the greatest, the 3D graphics are basic and it sometimes fails to start (Task Manager -> manually stop the RPEng process).
On the good side: pre-programmed intervals (just checked, I’ve been saving the good ones from the Workout of the Day), custom intervals, graphs showing performance and target zones (pace, cadence, HR), training plan generator, online racing, ability to export workouts to SportTracks and thence to Endomondo.
You can get a license key for a 20-day free trial period at the Digital Rowing site.
How reliable is your computer in a damp garage? 🙂