I got the TCI DEHP Pro-X like you got. They only had black so I settled for black. That's the cheapest I've seen the MSA Sordin Pro-X and I figured I'd jump on them now, especially considering the blurb on their website about Sordin discontinuing this model. I've wanted to try the Sordins since I was in college several years ago, just never bit the bullet. But I've never heard a single bad thing about them so I may as do it now while they're cheap and I have the money for it.
I don't really need the stock M&P rear sight. I bought the M&P 22 for a trainer pistol for new shooters and I've read that the 9mm's rear sight will fit it. The stock rear sight on the 22 has no dots and contrast sights like that can be difficult to see even for me, let alone a new shooter.