I went on it a little over a year ago. I experienced a honeymoon period with it, much like when I started T. Improved sleep, mood, and libido. This lasted for about 2 -3 months then I was back to baseline. Increasing dose had no effect, again just like my experience with T.
My current TRT provider asked me to wean off of it which I have successfully done. I've been off of it completely now for 6 weeks and can't say I've noticed a difference.
Google "Wellbutrin poop out", or "Wellbutrin stopped working", and you'll see what I mean.