Stopped in here several years ago on a summer trip to Vermont and tried the maple soft ice cream. My wife and daughter had wanted to keep on going and gave me a hard time for stopping but being the driver, I had the last vote. :-) So I stopped for the ice cream - they didn't want one at first, but after tasting mine, we ended up each getting out own. That was the first of many visits to the Green Mountain Sugar House! Since then this has been my "go to" place for maple syrup, and every time we are back in Vermont we make it a point to stop.
We were there yesterday (to get more syrup) and although I've purchased syrup in the past (its great on oatmeal), I'd never paid attention to the grades. The woman at the counter (very pleasant!) explained to me the differences and what the best uses of each grade was, and then we did shots of syrup. I recommend the Grade A Dark for oatmeal. :-)
Besides the syrup, they have many other specialty food items you may not find somewhere else, as well as many keepsakes and Vermont items. I've found their prices to be very reasonable.
So bottom line is, been there, done that, and will be back!