Spritzer – this is pure speculation. Some times I listen it too, that some model has problem with it, but nobody proved it. If it happen then it was very specific problem of concrete device (something broken) but not the general problem. My friend own Coriolan 2 both WES and he has absolutely no problem with them more then three years. He owns at about 5 STAX electrostats, so if Rudi amp will be problematic then he has found problems with it, but, as I said, nothing happen. STAX amps are perfect quality, all depends on fact what you expect from chain and which components you prefer to have, excellent high-end tubes composition for very sweet, warm and beautifully coloured sound, or very analytical very detailed sound, or you want have excellent rock-style „package“ for listening. As I said all depends on your preferences. Both Rudistor Coriolan 2, Woo audio WES, Ray Samuels A10 are absolutely excellent high end amps, together with perfect STAX supported one, built for connection electrostats with other devices in chain.