The Twine experience was a little different than the freelancer sites I have used before. I am still trying to figure out if I will use it more.
Fiverr.com is great for quick typical needs, but if you want something a little more custom or special, they don’t seem adaptable. You would often need to change your project to better match the definition of the job the creator advertises as his/her specialty. You cannot post a job and have creators give you bids.
Freelancer.com is great because you can post exactly what the job is that you want to have done, and the creators will search you out and give a bid, sometimes too many bids to review. This is perfect for me because most of the illustrations or other art I need are custom situations. However, this process can be a little burdensome if you just want a quick little thing. Also, Freelancer pesters you with several small fees during the process so you never know exactly how much the project will cost in advance.
Twine.fm is more similar to Freelancer.com. You post a job, and the creators submit bids. Twine seems more casual and the personnel seems more eager to give you their personal attention to help you through the project. Besides the bid price you agree to with the artist you choose, to pay exactly 20% extra to Twine. I think that is better than a bunch of little fees, but it does seem a little more than I expected. On Freelancer.com they charge the hired artists fees also. As far as I can tell, Twine does not charge the artists any fee, except an annual subscription if they want to enjoy premium perks. Also, Twine specializes in visual arts like videos and illustration, not in writing or other tasks.
I will probably give Twine some more business. I still expect to revert to Freelancer and Fiverr on occasions.