It is. I've developed a nice, chiming blues sound running both pups together. Generally, with the R6, I have the volume between the two about even but the tone rolled off a tick and a half lower on the bridge pup than the neck pup (which I set at 8). I run that through a Deluxe Reverb 64RI modded to get all the dirt out (no more breakup, clean as a Bermuda shore) and it's priceless for playing the blues . . .The maple cap on the R6 generally imparts a little difference to the attack. Plus, the main thing I like about P-90s is having both pickups on and mixing the sound by balancing the volumes. The R6 should be excellent for that.