I prefer the notched legs; quicker to set up.
Notches and leverlock is the only way to fly.
Love the notched legs, they work great.
The swivel on the other hand can be annoying. The knurled knob is tiny and can be difficult to hand-tighten so that the bipod is fully secure.
So I highly recommend upgrading to a lever lock, ordered from this site...
http://t-nuts.com/index.php?cPath=73&osCsid=9b75b4e3d580c0286f3356900baa8003