I had heard of previous issues with MRA barrels in the past for various manufacturers defects. Didn't want to hold some previous bad internet posts against them, so decided to pull the trigger. Currently waiting for a warranty issue to resolve itself...
I will post details, good or bad, once the manufacturer/retailer has had a fair chance to address it.
Personally, if you have the opportunity to inspect the barrel yourself, before purchasing it, and know what you are looking for, then go for it. I would be hesitant to buy one sight unseen.