I've been taking it on-and-off for about 2-3 years. My stack is basically just modafinil 200mg unless I'm going through one of my caffeine+L-theanine phases.
I've avoided tolerance by not continuously taking it - if I'm no longer noticing the effects as much, I come off for a while until I really need it again. That seems to have stopped me from building up a lasting tolerance.
Yeah there's a few, expect to visit the toilet on a regular basis, and you'll also retain water of you don't drink enough. Socialising can be a little awkward, and doing anything that requires broad rather than narrow focus (eg driving) can be a bit more difficult. I find my short term memory actually gets better, as does my ability to learn things long term.
I take it whenever I feel like I need a boost of concentration, it usually lasts about 6-8 hours so the latest I'll take it is 6pm if I want to sleep that night.
