I have a pair and have listened to them with several different amps both at home and at the shop when auditioning. The nice thing about these speakers is that they seem to play nice with a wide range of amps. The impedance curve does not dip too low, so they play nice with both tube and SS. Since they are a very neutral speaker, it is easier for them to show the characteristics of the amp. As compared to trying to correct or "balance" an overly bright or forward speaker with a super tubey amp, I would recommend an amp that leans just a bit in the direction you like. Right now I am running them off a 35W/ch old Marantz 8B, and while it doen't provide thunderous base, it sure sounds nice.
