I own the Shield 2.0 Performance Center, fiber sights, ported, with manual, saftey and I've got about 2000 - 3000 rounds through it.
Three word summary: I love it!
With that said, the same version of the Shield Plus is next on my purchase list. A 4" M&P Compact may come next, but ultimately both will be purchased.
The primary reason I want the Shield Plus, while already having the Shield 2.0, is because on the Shield Plus, the grip is slightly thicker than the Shield 2.0 and just fits my hand better. I like the additional capacity of the Shield Plus over the 2.0, and also the trigger style on the Shield Plus works better for me than the Shield 2.0
Going with the Performance Center version will give you a little smoother trigger.
As far as the Crimson Trace sight goes, it's no Trijicon or Holosun. I don't own one, but my research on it suggests the CT optic is a reliable low-end optic. I have no intention of acquiring any firearm with a CT optic.
I'd rather pay to have the slide milled for the specific optic I want.