Whatmough 303 / 503: Are they as good as they look

EAD Signature 8
EAD DVDMaster 8000pro
EAD PM 2000(x2)
Aerial 10T
Aerial cc5
Aerial SR3 (x4)
Shanling cdt100
Nordost everywhere
What I ment to say was, has anyone heard the 503's or the 303's and listed my associated equipment. Sorry to have been so vague.