It is a good site in general. The only annoying part are the hordes of Subcontinent freelancers that bid on everything left right and centre. You end up wasting time sifting through hundreds of irrelevant bids. Some of them hire PAs to bid on their behalf (24/7 on site) so I see people bidding on my projects who have no English skills, have no relevant experience. If you end up discussing your project with the PA they drop off, or just respond with "Yes", "No Problem"
Once you find a good freelancer though it might be worth it.