NEC Spectraview Reference 21: is it really good as it should be?

[francescom]

NEC Spectraview Reference 21: is it really good as it should be (because of the price)?

I could buy this NEC Spectraview Reference 21 second-hand but like new for 3000$
or (same price) new Eizo CG211, or (even cheaper) new NEC SpectraView 2190.

Is led technology absolutely better tha IPS panel technology?

Price for new NEC Spectraview Reference 21 is 8000$, so,
it should really be a lot better than any other new monitor for 3000$,
but I'd like some suggestion and opinion before resolving to spend all this money.

Thank you

Francesco