which is pretty middle-of-the road as far as rates go there. rarely takes me more than 2 weeks to find a new job on there. and that includes rejecting jobs I dont think i'd like.
the biggest benefits IMO are that they screen their clients very well (they know they're getting top-tier quality and arent afraid to pay top-tier rates) and negotiate to get you the rate you want. Also, they handle the billing very well, so even if the client is acting janky, you'll get paid.
I went through the admission process end of November but before completing it I got offered a project through my network which I'm still working on today, so I will probably only start using the service next month. There is of course some amount of marketing in their claims, but I think compared to other freelancing websites they actually provide a good deal for freelancers. Also, they do the invoicing for you and make sure you get paid regularly, which I find is a valuable service.
As a freelancer it's of course always better to get gigs through your own network, but I think sites like these are a good way to get started before having this kind of connections.