I’ve had decent experiences with both Boom & Bucket and IronPlanet when it comes to post-sale support. A buddy of mine bought a skid steer through Boom & Bucket that ended up having a hydraulic issue that wasn’t disclosed in the inspection. Their team actually responded pretty quickly, reviewed the inspection report, and helped work out a partial repair reimbursement. Process wasn’t instant, but it felt fair.
IronPlanet is solid too, especially if the equipment has detailed inspection docs and service history attached. I’ve seen them step in on major discrepancies, although the process can take a bit longer since there are more layers involved.
Personally, I put a lot of weight into post-sale coverage now, especially on higher-ticket equipment. Pictures and walkarounds only tell part of the story. A platform that will actually back the buyer when something major was misrepresented is worth paying a little extra for in my opinion.