I tried FRP and returned it within the satisfaction guarantee period. It's been a long time, so I'll try to remember why.
Their history is with HVAC, so they had a LOT of electrical HVAC tasks. They also had a lot of commercial tasks, I'm in residential. On the services Rigid was PVC, not IMC. I use IMC on services. Also IMC for underground branch circuit wiring. No IMC tasks in the book. A lot of NM tasks, not many EMT tasks. There were some basic issues like no task with 2 ground rods, like nobody there knew to drive 2 ground rods until I told them. The guy I spoke with claimed to be a master electrician, but he talked like a defensive salesman. The layout of the pages was odd, so you'd end up with a 250-page pricing manual. I prefer about 10 pages or less. I'd make it a book if I wanted to present it to my clients, but I do paperwork in the truck. I want to find the price fast in a few pages.
If you think it through, most of your work is 50-100 assemblies. Figure prices for those, guess the rest. After jobs are completed check reality against your prices and adjust if needed. I use Excel mostly for task pricing. Most important is to know your break-even and profit goal. Figuring time & materials for the excel sheet is easy after you do a task a few times.