MacBook Pro: 2:05.4
MacBook Air: 2:53.1
This is probably a good comparison (and likely one where a faster disk would make a difference). The MBP takes about 72% as long, or the MBA takes 38% longer. I suspect I can live with this — it’s not like I rebuild all files daily.
And it’s still nothing like the Xbench 1.3 difference (the MBP weighs in at 1.78 times as fast)…