Finally got around to trying this. My sample has lain untouched, inside an airtight box, kept (mostly) in the dark since I acquired it, probably around 2 years ago?
Started off with ~10mg sublingual/oral at 7pm. After an hour, when I was feeling only minor effects, I took another ~10mg. During the next hour the effects ramped up considerably. Visual effects were quite strong, everything looked very sharp and precise, almost hyperreal, and at the peak I was having open eye visuals I would associate with a low dose 5HT2A psychedelic - not geometric patterns exactly, but field of vision made up of many tiny pixels which had a faint rainbow/kaleidoscopic halo around them. Physically my body felt wonderful, tingling and a strong desire to move - felt like this would be great for dancing, sex or low level sports.
I felt intensely stimulated during the peak, which lasted around 3-4 hours, with a kind of seething, forceful focus that had a strong manic edge. Prior to dosing, I had planned to top up with maybe some MXE, but at the peak I had a definite warning feeling that anymore would be pushing towards a psychotic edge. The intense focus was almost too much, like a pressure in my mind. I spent an hour trying to remind myself of the various plot-lines in Game Of Thrones, skimming and re-reading short excerpts of volume 3 in an attempt to remind myself what had happened. I was definitely impaired at this, reading was a struggle - re-reading anything more than the simplest sentences several times. I was both acutely aware I was struggling, and at the same time extremely driven to try and understand. At the back of my mind I was also very aware that spending so much time over a complex fantasy drama of limited literary merit was a grand waste of time - which led me to meditate on the amount of time I (and people in general) spend on trying to remember and understand fictional worlds that really aren't that worthwhile, which proved useful and insightful.
4 or 5 hours in and it was easing off, but I was still feeling the effects til the early morning. I slept around 6am after 1mg etizolam - probably could have gone to bed earlier but I was enjoying watching films.
I also had a strong desire to be OCD neat (which is pretty out of character for me) - in the kitchen, late at night, I went to mix myself a cocktail, and laid out all the required items as precisely as possible, and then proceeded to make the drink deftly with a minimum of wasted action, which was highly satisfying.
I felt a lifting of my depression / de-motivation which persists during the day after. In conclusion, pretty pleasurable all round although I would say I had slightly too much. I guess around 15mg would probably be a sweet spot for me with this.