I wish apple would have used the intel x-25 drives like in the Hp envy's. You can get 320gb of ssd intel g2s for 500$ on the HP website
This is true however, HP uses the X-18 G2 and G1 (1.8" drives, there's no guarantee when ordering whether you will get a G2 or G1) in Raid0 and there seems to be a problem with the drive controller that causes the 4k read speed to be abnormally low. In fact, the 4k read speed is actually slower than the 4k write speed!
Subjectively, it is lightning fast, but given the cost I'm concerned about the 4k read speed in my Envy. Here are the results of a benchmark test on my drive (2x Intel X-18 160GB):
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
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Sequential Read : 469.045 MB/s
Sequential Write : 155.626 MB/s
Random Read 512KB : 253.068 MB/s
Random Write 512KB : 133.743 MB/s
Random Read 4KB : 10.294 MB/s
Random Write 4KB : 55.438 MB/s
Test Size : 100 MB Date : 2010/03/10 1:54:01
I'd love to see more benchmarks of the SSD drives installed in MBPs