I think that the use of modern and advanced tech in airsoft can be molded together with the "respect and honour" situation to a degree...
I've noticed with some Baofeng radios that they have a "dual watch" function, which means you can monitor two frequencies at one time. On one hand that gives someone a humongous advantage over the opposing team, and could be deemed unfair, on the other it could be considered a legit combat tatic.
As ricochet covered, it's usually will be up to the event admins/holders etc. if a certain object is allowed on that game day or not. From that point it's up to the player (or players) to decide if it's appropriate to use it or not, thus bringing up the "respect and honour" ideaologies.
Now what "honourable" and "respectful" means IS going to vary from person to person, hands down. Peoples opinions about whether or not night vision should be used, or if someone should be allowed to listen to the other players, changes between different people.
It could also vary by the caliber of the game: is it a Milsim game? a game with all your buddies? The Local CQB/outdoor field?
It's up to the player on what he brings to the field and what he finds acceptable. On top of that, other players have the choice on whether or not they're gonna put up with tatics like that or not.
In the end, if it's within the rules, the choice is yours to make, However, assess the situation before making a decision. Consider the factors in the scenerio such as the other players and the type of game you're at. If everyone seems cool with it, have at 'er! Otherwise some choices might piss people off, make them leave and then you're sitting there tac'd out...plinking but a lonely tree!
This goes for anyone playing (or thinking of playing) airsoft.
On the other hand, I've been looking at getting a Baofeng BF series radio myself. The dual watch is a great idea for if you want to listen to the team channel and you own squad channel for example. They also seem to be fairly popular at the fields i've been to. I am guilty of using the cheap ass blister-pack walkie-talkies myself and no earpiece, so i figure it's time for a change!