My R9 is set up PG-style, and it's quite an amazing thing to play. In the Rhythm position it's not quite as "woofy" as the standard HB, since the pickup is turned around...basically a bit brighter.
In the middle position, it really shines. I've found that I like it better with some OD; when playing clean it's a bit too thin-sounding for my taste. Playing through an overdriven amp is a completely different story--making small changes in pickup volume/tone can get you some awesome tonal flavors. Roll off the bridge tone, and it does a great Brian May impression, for example.
If I only had one LP I probably wouldn't go so far as to do the PG mod, unless you're trying to cop his tone and make it your own. I personally like the variations of tone, but can always switch to my R7 for the Dickey Betts middle position sound, which is also one of my favorites.
My 2 cents.
BB
PS...Here's a pic of my "Greenie" R9 [Courtesy of RS Guitarworks]...
