Hi Craig - I have the Eagle Creek eyeshades. I like them - thin, comfy. Only possilble glitches I see - the very thin "buckle" mechanism can be felt if you roll onto that side - this doesn't really bother me.
There can sometimes be a small gap between the rise of the cheek and the nose - a little bit of light gets in - again, not enough to bother me.
Finally, I've seen some pilling on the surface of the material.
However, these have been used regularly (but not daily) for six months or more.
I find I have trouble taking a nap in a room that gets a lot of daylight - this and a pair of earplugs is exactly right to take the edge off the light and the noise of daytime activity/two kids to allow me to catch vital make-up sleep.
(I only tune out the kids when my wife's watching them). <img src="/images/graemlins/smirk.gif" alt="" />
Dave