I've used Gin for several small to medium projects without too much difficulty. I think Gin is a good way to learn quickly since its ecosystem introduces you to a lot of the pieces you will need. Personally, I don't do enough web development to grow out of it, since my web related projects are not a primary focus.

One thing to note is that Gin's Context is not the standard context.Context, which some find problematic. Most (vocal?) Gophers prefer sticking with the standard library and Gorilla.