So lets objectively look at the differences, not just in performance but based around the price too.
Powerflex has a bushing replacement which we list on our website for $88.99 shipped anywhere in the 48 states.
COBB's RMM isn't just a bushing, it's got the bushing pressed into the actual mount, to make it easier to install for $155 shipped.
We offer free install on the COBB RMM primarily because it's an easier install to do, it takes us about 15-20 minutes. The Powerflex option needs the stock bushing pressed out, and the new bushing pressed in, this takes at least an hour in total. Depending on the labor rate of the shop you bring it to it can be $85/hr (which is what we charge, we're on the lower end of the spectrum), but can go up to $120/hr which isn't too out of the ordinary.
Add that all together and you still get
COBB RMM for $155 compared to
Powerflex which will cost $173.99-$208.99 depending on the labor rate.
So makes sense to me, go with the COBB RMM which we've sold WAY more of than the powerflex. We've got COBB RMM's in stock ready to ship! If you want to place an order for one, check the link below to bring you to our website to place your order, all I ask is that when you place your order, there's a comments box on the final page of checkout, just write in "Jurrian - FiestaForum.com" so that I know it came from this forum, and we'll process it and have it ship out immediately
Cobb 2014 Ford Fiesta Rear Motor Mount
Here's a pic installed: