The Spitfire is definitely a nice looking screen, I had one on a Rebel 250. But for the Zuma I just went ahead and got the Yamaha screen. It's ugly, being basically rectangular, but it seems to do a pretty good job. I noticed my GPS speed actually increased a couple mph with it on. I would have expected the opposite.
2002 Vulcan 750 (now being slowly reassembled) 2013 Royal Enfield B5
2001 XT225, 2009 Genuine Stella
1980 Puch moped