Yep, MK677 is an oral HGH analog. It really comes down to how you like pinning and how much risk you are willing to take on the legal front. Good quality HGH is superior to MK677, but you have to pin it AND it is illegal to buy without a script. MK677 (which is doing fabulously well in human trials so far) is taken orally (and like all SARMs it is nasty tasting) and is 100% legal to sell and buy in liquid form.
There are the pros and cons of both - so you can see why so many opt for MK677. Also, both HGH and MK677 need to be run for a long period of time to see any significant benefits. The first month is mostly body saturation, skin and hair improvement, and an improved feeling of well being. The second gives great fat loss and the beginning of connective tissue strength. Third on is where you start to really get good strengthening of connective tissues. DO NOT UNDERESTIMATE the importance of your connective tissues!!! You can avoid a LOT of injuries by keeping them strong.