I think the F 25 is a wonderful crossover, the only transistorized item in my otherwise tubed front end. I can't comment on the others, although I would think it would be generally the sonic equal of the Pass labs unit. The Pass is more flexible within its two way architecture, but requires stacked units to get it to three or four way, increasing expense and number of chassis. The Accuphase F 25 can be configured from two to four way, choice of three crossover slopes (12,18, and 24db/octave), phase reversal switch and volume control for each band. The F 20 is the same as the F 25, but in two way configuration, and to get three or four way would also require stacking the units.
Also, if you need three way only, the Accuphase F 15L is a wonderful sounding unit, I have one also and can't really tell much difference between the F 25 and the F 15L soundwise, although the F 15 is somewhat less flexible than the F 25 and offers only two slopes (12 and 18).
These analog active crossovers have become somewhat unfashionable with the availability of elaborate and flexible digital units, but I prefer keeping things in the analog domain for my vinyl front end.
