I know the Ed Brown Fueled line of M&Ps look impressive on paper, but has anyone had a chance to do a side by side live fire comparison with stock M&P vs Ed Brown's version and noticed any significant improvement in performance?

You can buy the m&p you want and add an apex gun smith fit or semi fit barrel at home. Its not hard to do ether barrel . Add the apex trigger kit just like EB does and have a stock looking m&p capable of 1" to 1.5" 5 shoot 25 yard shooter depending on ammo and shooter firing from a bench and good rest .

Our at home improved m&p with a apex GF barrel and there FST trigger group kit prefers 124gr fn home load or 124gr hst . Our upgraded m&p is a well seasoned 1.0 core model . After the barrel and trigger group upgrade you can add what other exterior parts you feel your need . Our stock extractor is still working well after around 22,000 rounds .

But it is your money so if 2100 dollars +++ seems like a fair deal , go for it !