The Borla Rep I've been emailing stated the RHO Offering from them is being pushed to mid-August.
He didn't say it, but from the tone of his email, I think they are having the same "It sounds terrible, so we're still tweaking it!" issue as every other aftermarket exhaust manufacturer.
To me personally, none of the RHO aftermarket exhaust setups sound good enough for me to drain a portion of my cash reserves for. MF still sounds better than the others, but again, it's not enough to justify the cost.
I know no exhaust for an RHO will ever have the burble of a V-Motor.
However, if they could demonstrate an increase in horsepower, that'd be a game-changer, and I'd be more likely to invest some money.
Right now, all they have going for them is, "It doesn't drone, but pretty much sounds just like the stock RHO exhaust."
IMO: All of them are one giant metal bucket of "MEH-BORING!"
This doesn't make sense to me because I've heard some exhaust systems for Inline-6 BMWs that sound amazing, from various Mod Channels on YT.