No More Long Waits on Companies Support Line - Nevahold.com
ratemystartup.com
ratemystartup.com
My tolerance of this is zero. I do not read the page - potential audience size -1.
I go to a page to read the content, not to be harassed by pop-overs. I see one, I leave.
Users are much more likely to perform an action (ex. subscribe to a mailing list) when it is presented to them in a pop-over. (At least that is what my experiences have been)
If you hate them or not, they do work and until the numbers prove otherwise site owners will continue to use them. The decision purely comes down to the best way to increase key metrics.
In full disclosure - I am the founder of http://RateMyStartup.com - The site lists new starts (and uses pop-overs). I would recommend checking out Nevahold.com directly to give it a chance. It really is a cool concept for a startup.