You do indeed lay down a non-refundable fee from the off, so if the property fails to sell PB are still quids in. I'd be wary of "local experts" who cover enormous areas and can't possibly know about new local restaurants, schools, transport links, parks, parking, clay soil, the Diverter, the best/worst pubs, or the new slides at Peckham Rye. Do you they really help you progress your sale? Do they have full chain details to hand to give to related agents in a chain when you have agreed sale and purchase? And as to their online reviews I wouldn't trust them - heard too much bad news. No to PB from me, rather fork out a higher fee on a conventional agent whose staff are incentivised by that fee to secure best price, and if they don't or if you decide not to move then there's no fee applicable.