Night and day difference in the -45, though our radios may suck more than most so I couldn't say how much it would matter in the T-34/TH-57 for the Whiting folks.
I dunno, never really felt a huge difference myself. I went back to using ear plugs and just turning the radios up. The biggest problem was having the CEP ear piece shift as you put the helmet on and that shit was painful if it shifted during the flight.
I would suggest trying to get ANY gucci shit you can in flight school. I told the NVG guy at south field my helmet sucked and was uncomfortable when I was checking out NVGs in the NVG shack. He drove me over in his golf cart to the PR shop, disappeared and came back and handed me a brand new zeta liner immediately. No questions asked.
Now, fast forward to the RAG, where we get our second gear issue. I ordered a set of Brown Bellevilles (maybe 2 sets?). I am 2 flights away from RAG-complete and sans brown boots. Needless to say the supply system (as fucked as it may seem) is a lot better in the TRACOM.
I like having them, and they are R&I required (or recommended?) here. I wouldn't spend money on them, but I am pretty sure NavAir is putting a big push to get it, with the explanation given that the reduction in hearing loss would pay for the device itself (disability payments).