Here is what Rod of webOS Internals said in a different thread:
Originally Posted by mk.ultra
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Stability and random reboot reports happen in the experimental kernel threads and the support email address which lands in my inbox. It's also part of our development process - we push the boundaries to the limit in the testing feeds and release what has no problems in the stable feed. Since I'm in charge of that decision point, you may assume I'm using all the information available to me, not just four benchmark performance results.
So, according to Rod (and what I have experienced), "we push the boundaries to the limit in the testing feeds and release what has no problems in the stable feed."
If you are concerned or feel new to the process, stick to the stable uberkernel at 1.5GHz. That is what I did.