I went and
checked out the 20 harp case, Jeff, and it looks to be a very,
very nice gig bag. It even has a place for a Chromatic to go along with those 20 diatonics!
I've got a
Seydel Softcase for 14 Harps and its a nice case. Keeps the dust off the harps and protects them (up to a point) which is exactly what I wanted in a case at the time. It securly holds each harp, and as you can tell by the pics on the website, there's a padded divider in the middle so the haprs don't bang together when you close the bag. The zipper is sturdy, functions smoothly, and the pull-tab is large, making it easy to grasp.
The hardshell case for the 20 harps also has that padded divider in it, but it looks to be removeable via a zipper (the website touts it can be worn as a beltbag) and there's a protective flap on each side. Wow. Very nice indeed!
It's also got a storage place for a microphone, associated cables, and tools.
I've been very pleased with the craftsmanship on my 14 harp Softcase, so even though I don't own a Hardshell case, I don't think you could go wrong if you decide to go for it. It's a very well thought out and designed case, sure to protect your harps and equipment.