If you're into DIY, before spending your money on the Apex kit, see if the DIY Berwell M&P trigger job mentioned here ( DONE WITH MY SHIELD!!! ) might do the trick for you. The Apex kit is great, but doing the relatively simple buffing yourself lets you get to know your pistol just a bit better (imho).

Many also seem to be doing a Night Sight swap-out.
Of course... There's also Talon Grips and Hogue/Pachmayr/Limbsaver grip sleeves.

Oh yeah... James at XD-HS2000.com is doing some great Slide Blasting/Gun Koting on the shields: Got my Shield back ... Apex trigger , TFO night sights, KG gun kote =)
James could the Apex, Night Sights and Gun Kote for you in one fell swoop