I have bought from Comet. Quick service but low inventory. I'm the type of person that want to get my stuff yesterday but it doesn't always work that way. I respect that the new owner of Comet is getting used to running the business.
I have been dealing with Cointaker for years and they have always been responsive and helpful. in fact the only issue I really see as far as buying anything pinball related is Mad Amusements. He's a dirtbag and a thief.