Best to see such monitors in a store for yourself.
A curved monitor should probably be the only monitor and should be centered in front of the person.
The wider the monitor, the more reason for a curve.
Edges are harder to see without a curve and if the panel is a fast tn panel, it will look washed out at the edges.
Worth is something only YOU can determine.
A monitor will last a long time so I advocate busting your budget to buy a really good one.