I was in block 219, row 20, seat 697 for the eventing dressage on 29th July. Had an excellent view and you can see both screens (scoreboard and live feed of the arena action).
Tbh I don't think any of the seats will have a bad view, maybe if your right at the very top things might seem a bit distant.
I sat in block 224 row 9 on the first day of dressage and had a fab view, in fact felt much closer to the action than I thought I would having seen the stands on tv.
I was at the top of block 212 yesterday and the view was amazing. To be honest the way the stadium is set up you will have a fantastic view wherever you sit going back on Tuesday now and can't wait x