I haven't bought anything from them but know they care about pinball and the community so you should be in great hands & I'll bet Dan is helpful after the sale if needed. I think their sale machines are a different group from their floor machines (I didn't see Riverboat Gambler on the floor in December) but they obviously know how to keep machines working well so I'll bet what they told/showed you is true.
Be sure to post your final experience here.