I've received the Treasure tubes yesterday and immediately installed them replacing the stock EH. Wow! Right from the very beginning it was clearly better than the EH, easily audible. I now have about 12 hours on them, the sound is improving significantly.
Compared to the EH, the soundstage is wider and the depth and height are also better, better layering and clearly more 'air'. Jim R warned me about the highs, but I can only say the the highs are very good, more extended and surely more energy than the EH which was good already. The lows are also very good, very strong and goes deep. The mid, well, sweet. Conclusion is, very musical and very recommended for use with the Paramounts v1.1. I did some changes to my Paramounts, the 3.3uF changed to the Jantzen Audio Silver Z- cap, the 0,1uF - Jantzen Audio Silver/Gold Z-cap, NOS TungSol 2C51 and changed the cables in the signal-output route with Kimber and DH Labs. I am using the DTQWT loudspeakers at the moment. It's designed by Troels Gravesen, it has a sensitivity of 95db which is ideal for the Paramounts.
Those tubes were heavily discounted at the Pcx and within a few days they were sold out. But discounted or not, those are a very recommended replacement of the stock EH tubes!