in general, you can assume which series of Dell monitors categories as below:
1. E-Series (Business Entry Series)
2. S-Series (Consumer Series)
3. Professional Series (Business User Series)
4. UltraSharp Series (Dell Premium Highest End Series)
the pricing also roughly sort in order
I'm not sure what's the selling price now, can't tell it's worth or not. if you asking the display good or not, it's always depend on end user requirements.

Yes, I used this model before.
you can use the search function here, this question asked many times before and answer is here. S2440L is not IPS panel, is VA panel. the most important is, you're happy with this monitor
just to share the confirm spec again:
S2440L = VA panel
S2740L = IPS panel (but is not AH-IPS panel)
Owh, i see... Thanks for ur informations...
But still wanna buy S2740L bcoz of glass things...