Personally, I wouldn't bother. I did not go through the upgrade process like Jfrech did, but I did own a new BAT VK-P10SE with Super-Pak for a year or so. I wound up replacing it with a Klyne 7PX 5.0 which I thought was much better. That Klyne was the best phono stage that I've ever owned. As always, YMMV.
Upgrade Phonostage
Have a BAT 10SE Phonostage with a MicroBenz LPS cartridge on a Classic Turntable. I am considering upgrading the phonostage with a superpak. Would love to hear from people who have upgraded to the superpak. What differences should I be hearing and is the upgrade worth the money. Have a Ref 3 preamp with a Pass Labs 350.5 amp and Final 1000 electrostatic speakers with a JL F110 sub. All comments appreciated.