I used uShip to deliver a motorcycle to me as well as eventually ship it to someone else. It was a different carrier both times but both were professional with good communication. I viewed the agreement much like an eBay auction, I asked a ton of questions and worked to get as much background information as I could. While that didn't mean things would be flawless, I felt I had done all I could to ensure I made a good decision in who would get my business. I haven't used uShip for pinball machines but know others that have with mixed results.
By the way, you do not have to accept the lowest bid. You can also consider the Service Provider's time frame, feedback, and profile before accepting a bid. Good luck.
Brad