amp for Meadowlark Shearwater's

What amps match the Shearwater's? would like to hear from ACTUAL Shearwater users. there have been mentioning of amps here and there in previous Shearwater threads, but it seems that this question has been "officially" asked.

The Stereophile review seems to indicate that the Shearwaters go well with tube amps. What tube amps/pre-amps are people using out there?

I'd appreciate any input.