I just ran a full report valuation on my airplane, and I am unimpressed. The full report is emailed to you quickly, and the first page is the "Report Summary" which includes lots of incorrect performance specs (it wasn't smart enough to catch the 2900# gross weight on later J models, it quotes takeoff and landing distances that can't be attained at 2740# or 2900# on an isa day, and it states the M20J range is only 700nm) and an "executive brief" with lots of adjectives. It also includes a "Base Value", but there is no description of how they arrived at that number (are avionics and hours included in this? It doesn't appear so)
The second page is the "Windsock Value Deep-Dive" with a note that it uses a separate model and "does not indicate exact results but should be used as a rough sense for explaining why the model breaks down the way it does". This has lots of inputs with numbers attached, but very little description of how they work. For instance, it added $4,189.47 for "Aircraft Capabilities" and $5,751.79 for "Aircraft History" (these are separate from avionics and airframe time), and it included a $0.66 adder for an engine 150 hours from TBO (I guess the model assumes TBO as the baseline and adds $0.66 for the last 150 hours?). There is no total line on page 2, but if you add the adders up mine came out over 10% higher than the estimate on page 1.
Some of the statistics on later pages are interesting, but the whole thing has a little too much AI for me to trust. I'll keep using Jimmy Garrison's guide.