Personally, I am with Dr. Awkward in this particular argument.
I like the new beholder better because it makes the game easier to run. Flavor is my business, and I can flavor it up as much as I need, but I like the mechanics to be simple enough and easy to run on the fly.
One thing I hated was the facing mechanic in beholders. I ignored it in the past, but it made the anti-magic cone swanky so I was sorta stuck between "rulesets".
OK - so if facing is important during a beholder fight, is it important to use facing rules for the PCs against the beholder's mooks? Mechanically, facing is bleh. Facing always seemed more wargamey than no facing, why introduce it for one monster?
I think the barrage rules make more sense with the simplified explanations given in this thread, so I'll keep it. It would be a pleasant suprise in-game.
And the whirring bladed hallway? I say keeeeewl! It reminds me of that scene in Galaxy Quest, when they were tryin to figure out why the hell they had the "stomper hallway".
I like the changes. I say that improving mechanics doesn't make the game less flavorful. I sense that the change in some iconic beasts scares people who think that everyone needs to have the oldfashioned vanilla ice cream instead of something else. Or a better analogy would be being told that snail-mail is better because it's what someone is used to -- no email allowed! if it improves the funtionality of my game, I will make the flavor of the beholder stay iconic myself with good DMing.