Levinson, Krell, Classe, Plinius, McIntosh

Has anyone auditioned these amps:

Mark Levinson 436

Krell FPB 350MCX

Classe Omega Omicron

Plinius SA-250 Mark IV

McIntosh MC2102

If you have experience with any of these, please give me your impressions. If you own one of them and enjoy it, please tell me why you chose it or prefer it to others,
if you rejected one of these, same deal.

Thanks.