Thanks for the responses. I decided to go ahead and get the Walker PMC. I was skeptical, but it really does make a difference in my system especially noticeable with percussion instruments and bass. It also seems to provide a smoother, fuller and more liquid presentation, which I like.
Anyway, thanks for the responses.
Since a lot of this may depend on the system in which it is used (important for people like myself who are new to this), below is a list of some of my system components:
Scoutmaster with JMW 9 signature tonearm, ring clamp, Shelter 501 and super-platter.
Blue Circle FtTH integrated amp using a Stealth M-5000 power cord.
AqVox phono stage connected to the FtTH using Nordost SPM interconnects, connected to the Scoutmaster using Cardas Golden Reference XLR interconnects and a Stealth M-5000 power cord for power.
Merlin TSM bookshelf speakers connected to the FtTH using Stealth MLT speaker cables and Analysis Plus jumpers.
MJ Acoustics 200 sub connected to the FtTH using Analysis Plus Subwoofer interconnects.