I've had my dealer's demo pair of Frey in my system for some time now. Mine comes off of their cable burner Friday. When I brought home the demos for the first time, they'd spent about a week on the old Nordost cable burner, but no time in a system. For the first few days, they had some obviously annoying properites compared to the Quattro Fil and SPM Reference they replaced. After that, they improved significantly, to the point that going back to the SPM/QF at the end of the week was a definite step down. My cables were burned in on the old Nordost burner for some period of time, and are now on the new Vidar. It'll be interesting to see how the new burner affects the break in.
