Cashman Field is chill. I was there for two Cubs vs White Sox Spring Training games in two days - a night game and a day game, so I pretty much got a full experience at Cashman over the weekend.
The stadium itself is pretty cookie-cutter. The bleachers are not all that comfortable, so I'd try to get a field seat or a plaza seat, which are individual seats. I imagine they would be easier to get when teams like the Cubs aren't playing.
With that said, the general admission seating in the left field grandstands aren't bad, and the view with the mountains in the distance is AWESOME. I would choose the grandstands over the bleachers any day. They have chairs up there and platforms with step-up levels for stadium-style seating.
I just may have to make the Cubs vs White Sox Spring Training weekend an annual thing, as long as they keep playing there!
Oh yeah, the games had great back-and-forth action and the Cubbies won both! GO CUBS GO!!! ;D