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Profile do some cheaper ones.
I have the cheapo 'Century' ones that don't have flip up pads on my long distance bike. I don't mind losing the hand position by the stem. In fact I often ended up riding along holding the elbow pads, this does make you sit up slightly more but at least your hands (and elbows/shoulders) and pulled in slightly, so it's not overly un-aero.
Aero-bar positioning for long distance riding is going to be different from the position you use for TT-ing (even a 24). Too aggressive a position and you'll struggle to use it for sufficient periods to outweigh the extra weight penalty. Slapping aero bars on top of existing drop bars (or bullhorns) isn't actually as bad as it sounds.
There are plenty of bits on LEL when you can slump into the aerobars and eat up the miles for a bit. I remember doing most of the Yad Moss climb on the aerobars.
This was my setup in 2009: http://www.greenbank.org/misc/IMG_0228.JPG http://www.greenbank.org/bikes/tempo/tempo7.jpg
Thanks. I mean ones where the pads flip up out of the way so that they don't hit your knees when climbing. Will take a look at the Zipp ones...