I think SS amps bring to the forefront what Grado's are best at; detail, energy and great timing. But as you say, they seem to deliver a more real musical presentation with tubes.
Incidentaly, Ive got a few unopened boxes of tubes that have been delivered.. I think that means I must be happy with what I've got at the mo; opa2107 and EF91's. The EF91's are great with the warm full bodied 2107 as they are very open sounding with extension at both ends, seem to be a good combo!
Good to know since I've actually got that same opamp/tube combo in shipment right now Hehe hope they get here soon my anticipation just went up a few notches.