My 2.4 with 120Gb OCZ Vertex UMBP goes from turned off to ready to go in 16 seconds. Apps launch instantaneously. My laptop is freakishly silent - it really seems like it is turned off and should not be working. Here's my Xbench disk results and I haven't upgraded my firmware yet for increased performance:
System Info: Xbench Version 1.3 System Version:10.5.6 (9G55)
Physical RAM: 2048 MB Model: MacBookPro5,1
Drive Type:OCZ VERTEX 00.PT1
Disk Test 225.65
Sequential 181.01
Uncached Write 252.21 154.85 MB/sec [4K blocks]
Uncached Write 172.37 97.53 MB/sec [256K blocks]
Uncached Read 101.71 29.76 MB/sec [4K blocks]
Uncached Read 400.19 201.13 MB/sec [256K blocks]
Random 299.51
Uncached Write 120.00 12.70 MB/sec [4K blocks]
Uncached Write 310.27 99.33 MB/sec [256K blocks]
Uncached Read 1721.93 12.20 MB/sec [4K blocks]
Uncached Read 821.19 152.38 MB/sec [256K blocks]
It only took a few minutes to install and now I'm hooked. I may upgrade to a MBP w/ a faster processor, but, I will definitely be running OS X off an SSD.