Generally the only way to "audition" used gear you are considering is to buy it. Then sell if it is disappointing in your setup. Been there done that. It can be a confusing, tedious and frustrating experience. Or, it can be rewarding when you get lucky with a good match (that word synergy). The only way to know is to go through the trial process. As Mechans said, the MF 308r produced a neutral/ too-sterile sound in his setup, and then with the fellow he sold it to it was "a bit on the warm side." So any recommendation of one component over another will be system-dependent which practically negates the value of said recommendation.