Dunno... looking at those three, Viva Audio Egoïsta, Trafomatic Audio Primavera, and in particular this monster Aries Audio Cerat, (the latter being directly compared with SR009 and Blue Hawaii, very favourably, as well as Viva - from one other user who heard both electrostats and italian Viva...
Well known info about Singlepower has been all over the place, as well as the members of the so called stax maffia repairing and modifying some of Singlepower amps on order to make them not to blow up (virtually) and thus safe for users. I remember reading about this at some threads.
Internal...
Trafomatic Audio Primavera (the owner and designer is building the new one, a successor, with separate chassis), Aries Cerat Genus, Viva Audio Egoïsta 845, and some others.
First two are relative newcomers, Aries Cerat Genus has been said to be better sounding even than Blue Hawaii with SR009.