Woo Audio 2 as a preamp?

What level of performance could I expect out of this headphone/preamp amplifier being used as a preamp? Is it on level with mid-fi gear like Jolida or can it hang with higher end stuff like Mcintosh, Cary?

Reviews are all saying it is a warm sounding headphone amp with a very large soundstage and lots of air on the top. It is also said to handle complicated classical peices nearly perfectly. ( very important to me as I listen to mostly classical with some acoustic and vocals thrown in )Do these sound qualities remain present when being used as a preamp?

Also what tube amp stereo or monoblock would compliment the preamp. Triode/UL switch would be a real plus too?
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Thanks, I should consider ss amp with the WA2. I have paradigms too.