I had some time this afternoon to run a head to head comparison between netTiers and SubSonic.
I used code generated using SubStage (part of the SubSonic 2.1 release) and I used RepositoryRecord as my base class.
I ran the same test against the same database using code generated by .netTiers 2.2
The test was a derivative of the one that Rob Conery used in his post:
http://blog.wekeroad.com/blog/subsonic-scaling/
When i say derivative, I mean I just wrote 100,000 records into the database.
I repeated each test on the same PC three times.
I found that .netTiers accomplished the task in 90 seconds.
Subsonic completed it in 104 seconds.
There was no more than a one second deviation from these averages.