I have bought companionway doors from this site from CruisingConcepts, located on Orcus Island. He sends doors all over the world and his work is exemplar. I looked at Zarcor doors on a boat near mine and they are not as well done as the CruisingConcept doors. I've been to Mike's workshop and all his saws are computer controlled and when you have his doors, there are no screw holes to be seen.
But here is a point I never hear about other doors--the companionway (cruising concepts) doors on my last boat was something the new owners wanted and I believe that these doors on my present boat will also be a selling feature.