Do they utilise product feeds and are they easy to use like AWs or a mare like CJ?
More like CJ but lower tier merchants, most of who you won't have heard of. It's been a couple of years since I used them but they were OK for a while with the one merchant I was promoting and then went a bit wrong for no obvious reason. To be fair that may have been the merchant's fault though.
My verdict would be to try them out tentatively but don't expect anything outstanding.