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As promised, I ran a series of tests today.

TEST 1: Dell U2711 in well lit office:

The test instructions said to test in a darkened room. Unfortunately, my monitor is in a fully lighted office environment, and turning off the lights is not an option. I received the same results when using my Lenovo X201 and my MacBook Air. The following numbers represent the specific square number in the test.​

  • 1-2 Not visible
  • 3 Maybe visible (but not obvious)
  • 4 Faint
  • 5+ Clearly visible

Test 2: Apple Thunderbolt display in a very highly lit room

Because I could not dim the office in test 1, I decided to test the ATD in my home office which had a window directly behind the monitor. It was a very bright day, so the environment was actually quite a bit brighter than my office environment in test 1.​

  • 1-10 Not Visible
  • 11 Maybe visible (but not obvious)
  • 12 Faint
  • 13+ Clearly Visible

Test 3: Apple Thunderbolt display in a darkened room

This matches the environment specified in the test​

  • 1 Not Visible
  • 2 Maybe visible (but not obvious)
  • 3 Faint
  • 4+ Clearly Visible

My conclusion is that the ambient light in the test environment makes a big difference. I really cannot duplicate the environment exactly... but I hope these test help you make your decision.

/Jim

Thank you MUCH for taking the time to do this!

I tend to work in darker rooms and glare isn't a deal-breaker.

The Dell has a heavy AG coating, which makes everything look grainy and not in a good way. I'd rather try the gloss.

My current monitors will differentiate 3 and above. 1 and 2 are virtually black and indiscernible and I have to gawk at the screen for a long time. I had read the Dell has problems with dark grays, so reading a condition where you saw the Apple had an edge is (to me) a good sign.

And I don't do anything with print anymore, where "wide gamut" and 10-bit processing would come in handy. But I know either 27" monitor will handle more of the Adobe RGB spectrum than my 23"ers...

With extra calibration (I bought a Huey Pro at the Apple Store a couple years ago), with profiles for morning/afternoon/evening conditions, those problem darker values you'd pointed out might be able to be coaxed out. (Dell calibrates their monitors at the factory as well...)

If I could choose, it'd be an Apple display with CCFL for the slightly better color range, but comparing the two the AG on the Dell is easily a deal-breaker compared to any nitpicks for the Apple.

Apple's return policy is a fair bit nicer than Microcenter's to be sure, in case I return it and go for a high-end 24"... but one can't have everything and I really don't like having multiple monitors hooked up at the same time...
 
I had a Dell 30" with a pixel problem. A row of pixels (top to bottom) just stayed magenta. I called Dell and the next day a guy brought a new one and told me to test it in comparison to the old one. After two days or so he called me and asked if I was happy with the replacement (or if I wanted a different replacement) and when he could be up the old monitor.

Their CS for top end products is awesome. For cheaper ones, not so much.
 
Certainly would swing it in favour of the Dell. Apple warranties suck, they should be different and offer 3 year warranties on computer products (not just for students)

What about Dell's 3 year advance exchange warranty and zero dead pixel policy? Blows away Apple's 1 year warranty

Yep, Dell's next day replacement is a serious consideration for 27" ACD v Dell U2711

My media card reader stopped reading the other day, one quidk phone call and within 10-15 minutes a replacement monitor was ordered and on its way to me for delivery & exchange the next day.

It's important to note, that they don't just pawn you off with a 'repaired' monitor, they give you a brand new one in exchange.

Fantastic customer service, and one that gives piece of mind for the 3 years.



Also the 100% SRGB & 98% Adobe RGB profiles that come pre-configured meaning no messing around for Photoshop / Illustrator and other color specific work is also great with Dell.

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With the Dell set to Adobe RGB color profile, in a darkened room (black out blinds on) I could make out all the different blacks.
 
While I can't make the decision for you... I can list the points worth considering:

ACD vs. Dell

  • Glossy vs. Matte
    If you can't control your lighting, go with the dell.
  • Limited connectivity vs. Loads of connections
    If you need to hook up other devices i.e. PS3/xbox go with the dell
  • Fixed stand vs. Adjustable stand
    If you need to adjust the height of your screen, go with the dell
  • Docks with a macbook vs. No docking
    If you need to charge your macbook and/or require integrated external speakers/webcam etc. go with the ACD.
  • Normal gamut LED backlight vs. Wide gamut CCFL backlight
    This one is entirely dependant on your own needs. So go with what you need.

Otherwise, I would go for the ACD as in my opinion it just looks more stylish and has better resale value. Plus, I've yet to have a problem with apple's support.

Hope this made your decision a little easier,

Adam

Mods please please pin this-

perfect explanation of the differences to a frequently asked question
 
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