Yep.....anyone can get a bad batch of anything.....I got a bad Michelen tire once.....but my wife and kids and I are still riding on em. I've seen and experienced 'fragile' Bheads before, but I sure wouldn't classify Zephrys in that category.
Had a long chat with Mark about all the improvements he's made to the head to make them stronger, and he did mention something about some bad welds early one, but that isn't an issue now.
Yeah they are wide, but vented, so don't see any reason for them not to fly well, never had a problem with my Zwickey Delta's flying or planing, and they aren't vented. Most planning issues have to do with Bhead alignment and form issues.
That's about all I know about them....but I've got some in from Mark and I'm going to shoot them this weekend. I'll let ya know how many I break in foam :D