First, I am only a "free-loading" head-to-head player, so feel free to flame and/or ignore anything I have to say

I have read some posts arguing about the effects of turning icons off so gunnery and spotting aircraft would be more realistic. Particularly, the 1000 yard single-ping hits would be virtually eliminated.
I say instead of debating the merits, try it out and see how much you like it.
I will be the first to say I have become very dependent on the icons. The precise distance combined with a good sight can permit awesome accuracy at unusual ranges and deflection angles.
However, having played without icons quite a bit, I found myself adapting to the visual range cue provided by the size of the target and eventually getting nearly the same accuracy. This is only a subjective viewpoint though, since I don't know for certain the ranges at which I am scoring hits. But I do know for sure I still get my deflection shots after only a little practice. I am positive I have sprayed with 20mm hispanos and 0.50 cals, and have still gotten plenty of hits well beyond 500 yards.
For reference: I don't use tracers. I estimate lead, tap the trigger, look for hits, and repeat until target is going down for good, I am out of ammo, the target has escaped, or I am shot down. Once certain of the aiming point on a non-maneuvering target, I reserve the right to hold down the trigger

As for spotting aircraft, having no icons does make it way more exciting

The computer may not quite accurately duplicate the visual acuity possible in reality, but it is good enough to have a great time without icons getting in the way. Of course identification of friendlies becomes way more difficult. I have news for you: unfortunately, even in this high-tech modern world, friendly kills are unavoidable. Most pilots didn't have Chuck Yeager's telescopic vision. Read about Vietnam pilots forced to use positive visual identification. A MiG-21 was just a spec on the windshield at 2 miles, so they had to get real close before seeing enough to get permission to open fire.
Of course the fact that the same planes are available to all sides and have the same markings makes the problem way more difficult if not downright impossible. But, despite the resulting complications, I find no icons to be both more realistic and more fun. Now if I could just get everyone else to agree to turn theirs off, since it greatly affects the frequency with which aircraft get bounced.
For all my love of ACM, in reality, 80% of all air-to-air kills ever made in every war (especially WWI and WWII!!!) were bounces with no ACM involved. For many (especially the targets), that means less fun. But if you really want realism, booming and zooming is how it was done. Whereas icons minimize undetected approaches and encourage endless furballing.
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[This message has been edited by streakeagle (edited 05-02-2001).]