Made with construct classic, but everything in it could have been done with C2 as well (I wouldn't recommend using CC over C2, especially if you want to make a large project like an RPG. C2 is far, far better, and CC has a lot of... issues).
Upsides? Tons of them. Easy to use but still powerful (basically as long as it's 2d, you can make it in construct), the program is updated almost every week, helpful friendly community.
Tshirtbooth, an influential GS user, recently decided to switch to C2 from GS, so that's a vote of confidence there. :) http://www.scirra.com/forum/topic59146.html