Jumping into this old topic, as it can be useful to someone who read it.

My personal experience with MK-677:
-good quality sleep (plenty of lucid dream)
-big hunger
-make me hold water

I didn’t get significant physical change, however it can be a good addition into your bulking as it gives you a crazy appétit.

Just be careful about one thing, it increase your blood glucose level, so you better supplements with stuff like chrome, ALA, Berberine, merformin, insulin…
I think the best association for that would be lantus.