First time I tried it, I felt like I was sitting next to Method Man. Great social strain, makes sitting around with friends entertaining. It will make you somewhat lazy.
Pretty intense. Great body high, but not too overwhelming. Great tingly sensation; somewhat akin to someone slowly washing all your pain, all your worries, all your stress, away. G-13 is weed for the soul.
By far, the best strain I have ever had the pleasure to combust. I'd equate it to the sticky dick-cheese of Hendrix. Hands down, a true winner. If you're looking for something to positively blast your mind, look no further.
One of the best strains I have tried to date. All-around uplifting, not so much "couch-lock;" more akin to someone rigging your frontal lobes to some high voltage lines and hitting random keys.
In addition to Blueberry, I have tried countless Blueberry hybrids. Blueberry Northern Lights #3 & 5, with Blueberry Yum-Yum being my favorite (apparently Ludacris's, too).
A definite recommendation to anyone who loves cannabis.