WBAC are likely to low ball it; I haven't checked recently, but I think their website asks you to give details of any damage on the car so their web valuation reflects their best, most realistic price before they see the car to appraise it.
I've got a friend who moved overseas last year and needed to sell their car quickly. They took it to WBAC who adjusted their internet valuation down because, in their view, the car was 'damaged' - it had a few small wear and tear stone chips consistent with the age of the car.
So, to the OP; if you do go the WBAC route, just be prepared for a drop in their web valuation of your car when they see it and appraise it.