Like you, I own an older iOne Pro and bought the PA301W/calibrator combo thinking the best results would come from a "matched" device. I've done a four or five calibrations in the last month using both devices, and I can't see much difference. If anything, the iOne does slightly better based on the post-calibration deltaE numbers. YMMV, but if I had to do it again, I wouldn't buy the bundle.
Geoff