Hey Tube Rollers - Thoughts on Shanguang Psvane?

I'm considering upgrading the stock KT88 tubes in my Cary SLI-80 amp, and have been looking at the Psvane KT88 tubes made by Shuguang. Having heard that their Treasure tubes are very nice I'm wondering if these are even better.
Please share any opinions you might have. I'm especially interested in knowing how the Treasures and Psvanes might compare in sound.