I recently inaugurated my Society6 page. I think is a good start for any artist, since you don't need to pay money in order to have your space on the site. The only thing you need are high resolution JPEGs and they make everything else for you. That's probably my favorite part, I have made my own prints and I could keep doing that but it's expensive for me to make only one. Therefore, I end up either making a hundred, which are difficult for me to sell on my own, or only one, which I don't want to sell. Since they take care of the production it feels great to forget about that part.
I feel like this website is also a good way to have feedback in what's working and what doesn't, what do people like, and make more in that direction.
Some disadvantages? People can't promote your artwork unless they have an account. I understand this as a strategy for Society6 to get more people registered, and for artists to visit each others' profiles and promote one another. However it makes the take off for any artist quite slower an it accelerates the fame of others out of proportion.
Does it pay fairly? For anybody wondering how much money they'll get putting their prints up, well, Society6 earns around 10-13 dollars per print, so you have to decide your profit keeping in mind that base price. However if you sell any other product, then Society6 has a profit ready for you. For example you'll earn 3 dollars by selling a clock, or 2 for a pillow. Is this fair? Well that depends, for example in my case many of the drawings I put on the website are sketches, little drawings and watercolors that I had at home and that I wasn't planning on selling. So I am making some money that I wouldn't otherwise. A person that normally sells their work for much more may find this as a loss. I think the strategy is to protect your most valuable work, and try to make something out of the work that you wouldn't sell otherwise.
Also there are many good illustrators in Society6, don't let the feeling that there's only one style dominant, there's a lot more than that. Explore it, make sure you make your own list of pros and cons, and if you do put your work up make sure to tell everyone about it, and let them know the days of sales and discounts.
Good Luck! :)