Same experience. I ordered on July 1 with shipping expected the first week of August. That got moved to late August...and then to early September.
I emailed them on September 3 and they responded that shipping had slipped to September 19. This morning SXTH customer service sent an email...
I like the functionality of the key card, but my current setup is an iPhone with a magbak wallet. Not ideal for carrying the key card. I've been looking for a silicone sleeve, or similar, to carry the key card separately, but haven't been able to find anything. I have some front pocket wallets...