I went last year. Viewing is not good from anywhere. People show up early to get seats in the bleachers (shaded), but there's a chain link fence between the seating and the field. There are two fields, the second of which is parallel to the first. They're stacked perpendicular to the seating, so seeing anything going on on the far field is even more difficult to view.
You can get access to the area behind the chain link fence (a 2nd 1/2-height fence separates that area from the actual field, and get autographs from the players at the far end of the field as the leave the sessions, but be prepared for a bunch of ignorant, pushy yahoos.
Bring a current roster, so you can see who is who. Bring sunscreen, sunglasses, and water. Binocs are a good idea. You can buy food and drinks at the various stands, and there's a fairly decent fairground atmosphere for the kids.
It was a blast, btw. I'm going again this year and plan on making it an annual event.