I have a SFG 2wt and have fished it several days this year. I purchased it with the Orvis superfine 2wt line, but I like it much more with my rio creek 3wt line. currently its set up with the rio creek 3 and the battenkill 1 reel. with this combo it will easily cast size 12 and 14 dry flies. Ive cast dry dropper rigs consisting of a size 14 EHC and an 18 brassie without trouble. Im not so sure how it will do with foam, especially anything bigger than about a 12. I purchased it specifically for the creeks where nothing else will work. The tip is very soft, you can easily play a 3" fish and keep it on the line with a barbless hook. Ive landed trout up to a foot with it and while that is a lively experience, it didnt take long enough to be of ethical concern. The fit and finish are great, it has the feel of a quality American made product.
I really like mine, and its not leaving my hands any time soon. when I wade small creeks for bluegills or really small creeks for trout its a prime candidate. In my opinion, 6'6" is short enough that it severely limits ones ability to hold line off the water and get good drifts. If you are fishing smooth slow water, it doesnt matter. If you are fishing truly tiny pocket water, it doesnt matter. I have found myself on 15ft wide pocket water type streams where I wished I had a longer rod. I say all of this to say - in tight streams with small flies its really great, just maybe not the most versatile rod in other situations. Its an extreme compromise in pursuit of a specific goal.
If you are convicted about wanting a 6'6" 2/3 wt, I say go for it! none of the "negatives" I listed are attributes of the SFG, just general truths about short light line rods.