Sal,
I really liked the system with the Goodman woofers and the YL 5500 compression drivers too. It might have been a little bit more dynamic sounding and vivid than the G.I.P. system, but, as with almost everything audio, there are some tradeoffs. To me, the YL/Goodman system was not quite as smooth and coherent, particularly with respect to the treble response, and I heard a bit more coloration, particularly in the form of tonal unevenness with solo piano. But, both are great, and I have not heard anything that sounds bad with YL drivers. The YL horn tweeters are also very good. The big plus with the non-fieldcoil system is not having to deal with a power supply and warm up issues. From a commercial point of view, the plus with G.I.P. drivers is that they are currently being manufactured while the YL stuff is vintage and quite difficult to find which makes production of such systems extremely limited.