<< A normal one has better quality than a flat screen?? Is that true?? How true can that be?? Then why is flat screen so expensive?? Enlighten me please. >>
I'll take a stab at enlightening you. Curved screens were created for one simple reason: to improve image quality. Why would a curved screen have better quality? The distance from the gun to the glass is constant for spherical glass. As the glass gets flatter, the corners of the monitor are much further from the gun than the center is. This distance change results in several possible noticible effects:
1) Blurry text at edges and especially corners.
2) Drastically varing dot pitch over monitor surface. Larger dot pitches tend to give more headaches.
3) Brightness variations (brighter in center than in corners).
4) Lines aren't perfectly straight. This is really noticible with CAD use.
These problems are often lumped into one term: convergence. Every flat monitor will have these problems, but some will have better convergence than others. High quality parts and good manufacturing techniques can reduce the appearance of convergence problems. Unfortunately this leads to higher prices.
Curved screens have one other minor benefit. Have you ever heard the phrase "the eyes in that picture seem to follow me where ever I go"? This is especially true with a curved screen. Families or friends gathered around a curved screen will all get about the same image experience regardless of the angle that they view the monitor. When gathered around a flat monitor, the person right in front of the monitor will have a different experience than those at angles. Try it yourself. Display picture of a person looking right into the camera on your screen. If it is a curved screen, that person will appear to face you regardless of your viewing angle. If it is a flat screen, the person will appear to face some odd direction unless you sit dead center.
Flat screens have two benefits:
1) Glare can only come from one angle. Thus the chance of glare is reduced.
2) Old low quality monitors were extremely curved (to keep costs down). At times, this has an effect of looking into a fishbowl. The majority of people that answer flat without giving any reason say so since they compare their new flat monitor to a 5-10 year old curved monitor. New quality curved monitors are much flatter than previous monitors. I'll bet the house that 95%+ of people wouldn't think my newer 'curved' monitor looks like a fishbowl. This was what Nortexoid mentioned - the curvature is drastically less for new monitors.
Conclusion: Take the regular monitor and put it next to the flat monitor. If the curved monitor looks like a fishbowl (large curvature) get the flat monitor. If the flat monitor has bad image quality (especially at the corners) get the curved monitor. For me personally, I could never use any current flat monitor since I do CAD like work and need high convergence all over the monitor.