I have used WBAC twice and no issues. On first car there were minor paint scuffs and alloy damage and I expected a degree of haggling and reached a fair differential on online price. Second car was in perfect condition and although WBAC system rejected this assessment by the dealer a quick call to his HO got authorisation and full online value paid. I would advise anyone selling to be totally realistic about damage/scrapes etc and assume a degree of erosion on price bid. Beyond that fairly straightforward, no overly difficult matters and monies paid promptly. Not sure I understand so many negative reviews except that seller expectation and buyer reduction can cause issues.