The downside of most of the doors is that the threshold of the companionway is below the level of the seats, hence, what was just described about the doors being in the way and not folding back all the of way. You have to take them off to lean back against the cabintop.
The ONLY good thing I've read about them is if you're where it's really hot and you have air conditioning is to use them for quick in and outs. Much quicker than the hatch boards, and quieter, too, at night if you need to get in or out whether AC related or not.
That's simply my report from reading about these things for 25 years. I don't know anyone personally who has them around here, but heard about the advantages with AC from a fellow 'board member somewhere over the years.