You'd think so, but actually no. I bought the 13" MacBook Pro with the stock 250GB HDD this weekend (act of faith that this issue would be patched... whew!) to replace my Unibody MacBook that has a 128GB Apple SSD. I ran benchmarks on each machine with both drives and the new 250GB OCZ SSD I just got from Amazon for the MBP.
The Apple drives never come close to the estimated 150 MB/sec of SATA 1.5:
MacBook5,1 (2.4 GHz MacBook) / 10.5.7 / 4096 MB / Hitachi HTS545025B9SA02
Xbench Results 49.633450
Uncached Sequential Write [256K blocks] 73.56 MB/sec
Uncached Sequential Read [256K blocks] 75.60 MB/sec
Uncached Random Write [256K blocks] 24.52 MB/sec
Uncached Random Read [256K blocks] 20.72 MB/sec
------------
MacBookPro5,5 (2.53 GHz MacBook Pro 13") / 10.5.7 / 4096 MB / Hitachi HTS545025B9SA02
Xbench Results 48.946800
Uncached Sequential Write [256K blocks] 72.60 MB/sec
Uncached Sequential Read [256K blocks] 74.64 MB/sec
Uncached Random Write [256K blocks] 23.03 MB/sec
Uncached Random Read [256K blocks] 20.46 MB/sec
---------
MacBook5,1 (2.4 GHz MacBook) / 10.5.7 / 4096 MB / APPLE SSD SM128
Xbench Results 89.102165
Uncached Sequential Write [256K blocks] 42.59 MB/sec
Uncached Sequential Read [256K blocks] 94.34 MB/sec
Uncached Random Write [256K blocks] 20.39 MB/sec
Uncached Random Read [256K blocks] 88.12 MB/sec
--------
MacBookPro5,5 (2.53 GHz MacBook Pro 13") / 10.5.7 / 4096 MB / APPLE SSD SM128
Xbench Results 80.782715
Uncached Sequential Write [256K blocks] 36.78 MB/sec
Uncached Sequential Read [256K blocks] 94.87 MB/sec
Uncached Random Write [256K blocks] 20.43 MB/sec
Uncached Random Read [256K blocks] 90.07 MB/sec
----------
MacBook5,1 (2.4 GHz MacBook) / 10.5.7 / 4096 MB / OCZ-VERTEX v1.10
Xbench Results 234.562485
Uncached Sequential Write [256K blocks] 104.18 MB/sec
Uncached Sequential Read [256K blocks] 205.20 MB/sec
Uncached Random Write [256K blocks] 108.65 MB/sec
Uncached Random Read [256K blocks] 154.77 MB/sec
------------
MacBookPro5,5 (2.53 GHz MacBook Pro 13") / 10.5.7 / 4096 MB / OCZ-VERTEX v1.10
Xbench Results 193.787308
Uncached Sequential Write [256K blocks] 94.55 MB/sec
Uncached Sequential Read [256K blocks] 118.21 MB/sec
Uncached Random Write [256K blocks] 98.45 MB/sec
Uncached Random Read [256K blocks] 108.76 MB/sec
These numbers are pre-patch, of course....