proac sound vs coincident sound

Is ProAc cold and analytical? Does it require tubes to be listenable? I was interested in Proac but then I read this in the Stereophile Aug. 2008 review of the D28s:

I drove the D28s with Musical Fidelity's kW monoblocks, as well as with the 100Wpc Music Reference RM-200 tube amp (reviewed in April 2002)—which ultimately proved a better match for these speakers. The kWs and D28s produced a somewhat cold, bright, overly analytical sound on top, complemented by exceptionally taut bass. Switching to the Reference tube amp produced the creamy, warm, inviting sound I'd heard from the D28s in Tempe, giving up only a bit of the kWs' bass clarity, control, and definition.

Very interesting. I've had the impression from the forums that Proacs in general
were in the British Harbeth school--"forgiving," which
I thought meant not too icy or piercing.
I guess this British sound is confined to, say,
Wilson Benesch, Spendor, maybe Tyler from what I've
read on the 'gon. At least that's my impression from
my reading here. Thanks.

So do you like the Pro Resp. 2.5's? No fatigue there?
Smooth vocals? Would they work with high-quality solid state, if you have heard them with those amps?

Same question for the Studios.

Thanks a lot for any comments!