I actually purchased this for long runs but I now use it for rowing and biking.  Even then I only use them when my Cw-X and Skins are dirty.  They provide decent function for the muscles but the quality of the product is horrible for the price.  They are only worth $20 to me.   I still use them, but only on low training days.

I use for 45-60 minute fast bike rides for exercise. Just perfect padding and feel for what I do.

I just used it on an Olympic distance tri and it performed great.  I used the pockets to store some gu for my run.

Very comfortable on swim, run and bike.
Dries fast after swim
Pockets in legs plus 2 pockets in rear
No cons

This product is designed perfectly for the summer tri races.  It is comfortable in the water, on the bike and running.  It is also supportive of the thigh muscles.