http://www.domainspa.com/testimonials.asp
I have only experiences of nameRENTers and DomainSpa
because I want to receive money via paypal.
So, I don't know much about other similar services.
Actually, I think that they have some negative factors in DomainSpa;
- Traffic from far east has no value.
I think that it is same to other services.
nameRENTers blocks accessing from Japan, for example.
- No web-based control panel at the moment.
Currently, they are handing manually.
I heard that they were going to provide it in near future.
- No information of _each_ domain performance.
You can get restricted report at the moment, e.g., average
hits per day for each domain and _total_ income and hits.
- No support for .name domains
Who needs ?
And here is positive factor;
- The results always go over $3 per CPM for 4 months.
It's quite better than nameRENTers ($2.50 per CPM).
Good luck!
(sorry for temporary deletion)