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Full user review
"Boot time reduced 25%"
Works as advertized.
No Mac AppStore availability
The fully compatible Mac OS X Lion version of iDefrag 2 was recently released (v2.1.0) -- which now allows boot-time defragmentation. After running iDefrag on my MacBook Pro (Core 2 Duo, Mac OS X Lion), the boot time went from 78 seconds to 58 seconds (25% improvement). Additionally, all applications seemed to start faster (observed - no metrics).
There was a lot of conficting information on the Internet -- on whether defragmentation had any value on Macs. In my experience, the improvement was well worth the price.