How has the NAD M2 (Class D) aged?

I remember when the NAD M2 came out around 10 years ago, I lusted after it but could never bring myself to pay full price for it.  I snagged one used recently and am in love with the sound.  The separation between notes is fantastic.  I remember years ago this amp was on Stereophiles "Class A" Recommended equipment too.

This leads me to ask: how has the NAD M2 aged?  How does it compare to newer Class D amplifiers?  Has anyone listened to this amplifier and compared it to other more recent Class D amps?