ULA Equipment 'Epic' backpack (harness around a dry sack)

Anyone seen these before? Anyone tried them?
ULA Epic looks like a novel idea. It's a full backpack harness with no real sack built in, but is designed to be used with a dry sack (and ships with a s2s dry sack). Looks like the aluminium bars are removable, for a very light weight pack.
The weight is listed as 32.5 ounces (0.9 kg), but it's unclear to me if that includes the dry sack or the optional aluminium frame.
It seems like a good idea, but I'd be curious to hear from anyone that's used them in the wild. Ie, is the harness any good, etc?
PS. I like the disclaimer below the picture: ALPACKA Raft not included
* I am about to add them as an advertiser here
ULA Epic looks like a novel idea. It's a full backpack harness with no real sack built in, but is designed to be used with a dry sack (and ships with a s2s dry sack). Looks like the aluminium bars are removable, for a very light weight pack.
The weight is listed as 32.5 ounces (0.9 kg), but it's unclear to me if that includes the dry sack or the optional aluminium frame.
It seems like a good idea, but I'd be curious to hear from anyone that's used them in the wild. Ie, is the harness any good, etc?
PS. I like the disclaimer below the picture: ALPACKA Raft not included
* I am about to add them as an advertiser here