Have used WBAC twice and each time the online valuation was way over the price offered and over what personally expected and this is with 2 x clean cars, so it was not me hoodwinking them on condition, they even do a paint thickness test.
However, the price i wanted was realistic and between the online and their initial, which made clear would happily walk away if not receive and as they were good clean cars, they actually did not want to let me walk, and we agreed good price.
That all sounds a lot, but its 10 mins to get quote and arrange inspection, the inspection is about 20 mins including all documents and about 10 mins on the haggle (as he called his manager, yes really, that one!)
So with these, its matter of setting self a realistic price you could sale private, and if these companies within that ballpark you make the sale, if they are not, you just walk and try the next one, which if you keep having to do that, your expectations are too high, so would say the diligence to understand a good price underpins everything - as someone has said, due to multiple reasons its a good time to sale at moment as know couple how have been pleasantly surprised recently at work, one on Motorway and other on Wizzle