I have the 2 gauge pillar pod from Miami-GT.
Its not the same colour as my interior OEM trim, its darker, however you can't really notice it once your sat in the car.
I'd guess that the 3-Gauge pilar pod from Miami-GT is a composite like the 2-gauge I have.
Im happy with the finish of mine, and to be honest its hard to colour match gel coat so its like OEM.
IMO, it could do with being a little longer where it runs above the door so that it tucks under the plastic trim covering the B-pillar, I extended mine by 1/2 inch.
I've used a plastic screw to fix it to the A-pillar where there is a threaded hole for a grab handle like you have on the passenger A-pillar. A bit of velcro at the base of the A-Pillar secures it lower down, and tucking it into the B-Pillar trim secures it above the door.
I've never seen the Envy one, so can't comment on that.