A few thoughs come to mind:
- Why has the seller listed two sets of frequency responses?
- Valve amps come in a variety of configurations, e.g. SET, push pull, would have been nice to know the way these are setup
- Lower powered valve amps (and these have a claimed 10w output per channel) like to be linked up with an efficient par of speakears. 86db/w is roughly on par with my old Linn Kabers, and they are NOT considered to be efficient. Most valve amps are recommended to be used with 90db/w plus designs (at least). Assuming the specs are correct, these will never play loud in a million years.
Having said all of that, clearly I've never heard them, and they could be amazing.
Personally I wouldn't touch them with a bargepole.