I've been on for 6 weeks now, 10mg daily, did a week at 20mg to check for side. I have felt absolutely nothing(2 brands), no tired after taking it, dreams, numbness, tingles, cramps(I am prone to cramps also) or anything else.
I take it before bed, only if I have dinner minimum 2 hours before I go to bed(80% of the time).
8 weeks into cardarine also, 10mg daily with 20mg on big days. That increase I can notice the difference in endurance until lunch...6ish hours and 3 meals later.
What I have noticed is without a calorie change I am not loosing weight but very slowly recomping, and I only workout light atm due to current health issues.
I think MrGrandpa and MrBlitzz have the gains side of it worked out though, from what I can gather if your after gains it will food partition an anabolic agent straight to your muscles.
The guy I know who's used it for a year said his hair and nail growth is off it's head. Growing up as the son of a hairdresser, if it's doing that it's having a good systemic impact.....and I have seen someone with a terminal wasting condition need to stop it after 4 days due to hormonal issues aggravating the condition.