I m trying right now the Burson Conductor that has the same amp of the Soloist
I have a concero HD as well
headphone: audeze lcd2
sometimes I prefer the bright, fast and detail of Burson Dac/amp, some other times I prefer the musicality and mellowness of the concero HD
the same my girlfriend, that is not an audiophile at all, and she just like to listen music: the kind of person that I trust!
so: soloist and concero HD are for sure a great choice