Does Super-O intensify over years, or is there a plateau level?

After the first year where I had numerous Super-Os, I decided to take a break. I started-up again with smaller toys since the Super-Os were getting too intense. I haven't experienced one yet but with the MGX, but I feel that I am on my way again! If I get the Eupho-Trident (or Helix), I very likely would!

Once you got rewired and have been experiencing Super-Os regularly, does the intensity and quality of climax keep increasing gradually forever, or does it reach a certain level and stays there?

This is a tough question to answer. IMHO, there probably is a plateau level for each individual as the body only produces a finite amount of hormones and neurotransmitters and there are only a finite number of appropriate receptors for these compounds. However, with that being said, the body is constantly renewing and rebuilding itself, you are not the same person you were a few years ago (see The Truth About Your Body’s Cell Regeneration). In reality as we age the body may actually decrease its capacity to respond and hence apparent intensity and quality of orgasms may decrease as well. Here is where a paradox occurs, it is our mind which interprets all the sensory data our bodies produce, it is our mind (conscious and subconscious) which assigns and judges the quality of those sensations. It is our mind which determines the quality of the pleasure and it is our mind which can continue to grow and develop throughout our lifetime. IMHO, it is our minds ability to reassign the perceptual value of sensory data which is the limiting factor governing the intensity and quality of the orgasmic experience. If you can imagine more intensity then you can experience more intensity.
Good Vibes to You !

I'm going to say that the intensity of the Super Os surprises me every time!!

It has been some time (several months) where all I had was very limited minimal pleasure and hence started seeking herbs that may relax me and allow me to get pleasure like I used to before (used Aneros from time to time for about 5 years now).

But just 10mins ago I came out (damn alarm clock) out of an amazing 3-stage SuperO that lasted 25 minutes!! And would have probably gone on for longer. It has tensed my body, then relaxed, provided swimming, drifting, physical and mental pleasure that is simply hard to describe. It was so intense that I couldn't believe it! After such a long time. I don't even know what triggered it, I guess it was the longest I've gone without sex (10 days), also being very sexually charged and fatigued from little sleep last night.

And I know that we're supposed to say that superO pleasure for some would be a calm moving wave, or something not as strong as an ejaculatory orgasm, but let me tell you - that was stronger and so long and beautiful I wanted to cry!! I just kept cumming with my whole body!!

So I think that it may change over time, slow down, speed up, break up, but when and if it returns, it will seem like the very first SuperO all over again. For me at least.