Amps in the same class as Pass XA.5 series

Thanks for the replies everyone. There is some diversity of opinion but as usual some strong opinions about Pass XA.5 amps. Class D amps are gaining some supporters too.

Is there something fundamentally different about class A amps or can a class A/B amp provide that warm, effortless musicality?

Thanks for the reply Mechans. It's all subjective in this hobby isn't it? I don't get the oportunity to hear a wide variety of gear so I'd just like to get some names to consider.