I was a bravo co guy as well, but a bit further back.
Here's what I have to say. Dont be a gear queer. But dont skimp out either. When you deploy overseas you will appreciate the UA stuff.
And dont get into the mindset that if the enlisted Marines have to use issued gear that you do too. That attitude isnt advised, because:
1) Contrary to popular belief, enlisted Marines have money to burn on gear. Enlisted Marines have a card that gives them 3 square meals a day, and a barracks space rent free. Their only expense is that $1200 pickup they've had since their junior year of high school and the car insurance. They have money to burn on gear like UA, and it's worth their while. I've seen entire grunt companies where every Marine had the UA trash, and they were deployed with me in Afghanistan. The UA is easy to clean, smells less, weighs less (you wear 1 and you pack 1...no need to carry any more than that). And when you're working at 120 degree temps at 9000+ feet, you friggin want some moisture wicking technology to keep cool.
2) If you go around with that attitude that the Marines have to use issued gear, and you underline that point by your own refusal to use the highspeed gear, the Marine wont make the choice for field comfort. He will feel stymied. That's not the impression you want to give to the troops.
3) You wont win any points with your SNCOs by pretending to be a hard dog by refusing to let your Marines buy the gear for troop comfort.
4) You dont get the Marine Corps to fix its issue of gear by refusing to buy gear from third parties. You get the Marines Corps to issue good gear by buying it from third parties. How do you think that PolarTec fleeces, beanies, and gloves appeared in our 782 issue? Or CamelBaks for that matter (although the issued CamelBak leaves a lot to be desired). Or GoreTex? Or neck gaitors? If it weren't for Marines spending their hard earned cash we'd still be humping around with ALICE Packs and ponchos.
Lastly, folks here have talked about pilots not being able to wear synthetics. True. And I wouldnt advise it. However I would recommend that even the average pilot and NFO still pack the UA because there is plenty of time the Marine pilot spends on the deck in extreme hot/cold conditions, not to mention the inevitable tour as a FAC/Air Officer.
Just my experience.