I've had my Stratus for 2 days. I'm not listening that much, just letting it play with some break-in tubes. I will say that it is very neutral. My other amps are quite dark, so i will have to make an adjustment before I can really compare them. It certainly does add some left-right separation to both my K-701s and Audeze headphones. I'll listen more seriously in a couple of weeks. However, I am not much of a wordsmith and i don't do A/B-type critical listening, because I find it difficult to hear any convincing differences when i do when i am not able to relax and enjoy the music. I'll worry about tubes, headphones, cables, etc. after that. I have some used no name single plates that are very old and the AVVT meshplates to try out once I do. Right now, it's got some no name used double plates in it.
One thing I will miss is the tube swapping i can do with my SinglePower MPX-3, which has allowed me to find several driver-output tube combinations (among the 10^9 choices i have) that give me great enjoyment. Selling it for the little money it will fetch seems a tragedy, but I have too much stuff - all of which I love and not enough room to store it all.