I've tried both Ostarine and mk 677,
Took Ostarine when I was on tour overseas (couldn't get gear pass customs), it produced the same level of results that 25 d-bol did for me. So yes, I was impressed. No sides. Felt great on it. No suppression. Blood test were perfect and I didn't do any type of PCT.
MK667 was another story. I recently went on a natural cut and thought I'd start it prior to my gear cut later this Summer. No go. Between the water bloat and the increase in hunger, I gained 10lbs in less than a week. Frustrating, as I was at 12% BF and with 10lbs increase went over 15%. And yes, I know it was diet and my inability to keep my mouth shut, but the increase in the munches was off the chart. After 2 weeks I stopped and I've lost maybe 4 lbs of it. Just went for a blood test today to see if there is anything going on.
On the plus side the sleep was much deeper and the vivid dreams alone make me want to take it again. Sex dreams, flying dreams, and so unbelievably real.
I got very quick results with Ostarine. But for MK667, which someone mentioned above is not a true SARM, I've read that it takes months to see any results. Once I stop competitions, I'll probably use SARMS, unless of course they are banned or new medical test show it's more harmful than what we know today.