Yes, they are an open design. Grado has a nice rich, deep bass without being bloated or boomy. But they are definitely known for their mids - strings are killer through Grados. Electric guitar is outstanding.
Sure would. I own a pair. And a pair of 325's
Most of the Grado cans are a bit too bright for my tastes, I like an exciting headphone but the Grado give me ear fatigue pretty quickly.