We've sold off what we call "Verticals" of our company to a competitor in the past. A competitor that previously we had helped co-found and had very horrible interactions with. So we had zero trust in dealing with them and wanted the contracts to be rock solid. The process took forever to agree on a contract, the payment process, putting the money in escrow, etc.... Part of us didn't want to have anything to do with selling something to this company because we despised them. But business is business and their offer was higher than what we could get from anyone else.
Long story short, the process went fine. We ended up selling another vertical to them, and then another. All 3 sales went through fine.
This is the lawyer we used and he also happened to be local.