I had something between 50-60mg (plugged) a few weeks ago of the freebase. The first hour was a little unpleasant. Somewhat anxious, hints of nausea and a general feverish kind of feeling. After about an hour I was a bit disappointed not more was happening, I felt mostly sober other than that things looked a bit "off", but no real visuals so to speak off and no psychedelic confusion.
About 30 minutes later things started kicking up a bit though, I decided to go outside and wandered around in the park for several hours. At times I'd get this feeling of being floored, like having taken a bit too much MDMA, where you feel a bit woozy in a really good way and your eyes roll back into your skull. I sometimes felt like I had to sit down, but never really did and mostly just kept walking. OEVs were there, but nothing too special. Staring at a point in space would quickly lead to some peripheral movement which would then gradually move to the centre but only develop up to a certain point, then the visuals would just repeat themselves. Not like shrooms or acid where layers and layers of complexity keep on adding one on top of the other and the hallucinations are constantly changing.
I think around the 5th or 6th hours things started to fade away but I still felt like I was on a decent bit of MDMA (without the gurning strangely enough) for another 6 horus or so. Knocked myself out with some clonazolam that night.
For clubbing I think a 50-60mg dose would be ok, but I'd dose about 2-3 hours before going to the event, that way the heaviest body part will have faded and it'll be easier to handle and you'll have more energy to dance and chat.
EDIT: I'll add to that that previous attempts with lower doses provided me with mixed results. Tiny doses 1-5mg are quite nice when taken in the morning with a cup of tea for all day long mood lift (only becomes apparent after a few hours). Doses between 15-25mg provide little in terms of positive effects and body load, flushing, cramping, etc. prevail.