I've owned and used a few of Bybee's devices, both freestanding and built into cables, for quite a long while in various places in my systems. I currently use none in my main system, as they provide no net benefit there. I use a pair of speaker bullets in my office system, where they provide a modest improvement. They do have some effect on the sound that is sometimes helpful and sometimes detrimental, but it is always subtle. At their prices there are many options (yes, including Ric Schultz' modded Wimas which I use in my N-Cores) that provide the possibility of much greater subjective effect, and used selectively, improvement.
So at Bybee's prices, for most of us cabling and cap rolling can get better results for the $, IMO. For those for whom money is no object and who already have got very dialed-in high-rez systems, they are worth a try, but like everything, matchups are key.
