I think we have much to look forward to in the new "Bucks" arena, particularly with regard to seating comfort and geometry. It may prove to be a venue people will actually want to return to, rather than merely tolerate due to lack of alternatives.
Recent Populous arena designs have straight seating sections along length of the basketball court sidelines, with the end seating zones focused on the center baselines. This is a vast improvement in seating geometry over the "extended octagon" configuration of the Bradley Center, where in many areas the seats are aimed far off-court. There will also be a maximum concentration of seats close to the playing floor (INTIMACY), as the seating is "top-loaded", as in many theaters. Also, expanding the lower bowl outward allows the pitch of the upper seating to be relaxed, with comparable sightlines.
Based on Feigin's revelation that the new arena willl be about 30 feet shorter than the BC (or about 415 feet), and assuming end-zones are indeed focused on the mid-baselines, could mean seating rows spaced 33-34 inches in the upper section (compared with 31-32 inches in the BC), and lower bowl seating rows spaced 34-35 inches (compared to less than 34 inches in the BC)

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Unlike the "basketball-centric, short-octagon" arenas (Indiana, Phoenix, San Antonio, Brooklyn) the Poulous configuration affords good seating angles for a variety of small-floor as well as long-floor events. The new arena's geometry wll be as good as (or better) as the optimal "elliptical" configuration used in Madison Square Garden and the L.A. Forum (now a prime concert venue).
I do appreciate the Pettt's gift to the community, but we should indeed be much better off (less neck strain and better circulation in our lower extremities) in the new venue. I am not directtly involved with the design, but I do follow details of these facilties closely. This time, we will not regret the outcome.