ESL 57s will be added to my system soon. What to expect?

[Firebottle]

EDIT: Has anyone driven ESL 57s with a small Triode amp like the Audio Note One kit amp? Is sports a mere 7.5 watts.

I have driven mine with a low power OTL amp. It puts out 6W into 8 ohms so in fact probably puts out nearer 7.5W at the mid band impedance of 10 ohms, plus a little more at the bass end where the impedance is greater.

Not deafening levels but pretty loud.