I just discovered Shutterpoint (www.shutterpoint.com) a few days ago.
I've been there for the last nine months (this is one of the sites to which I submit my high res images), with two sales totalling US$70, from which I get 85%. Minus the subscription price, I still have a profit.
Pros: easy upload, IPTC and EXIF data reading, interesting discussions in their forum
Cons: no submission screening, so too many highly-amateurish images ruin the site's portfolio
In my point-of-view, it's a good site if you want to use it as a showcase of your portfolio that you can send a link to your potential buyers and eventually make a sale from the site itself. You can do the same thing for free at FeaturePics, with the advantage of the resizing option, but SP seems to get a better exposure from Google search.
Regards,
Adelaide
PS: I forgot to say that usage terms are different from microstock sites, they are more like the extended licenses, allowing reselling items and such, so for those purposes the "high" prices (minimum of US$20) are not exorbitant and one may think.