I want to share my experience on other agencies after dropping the exclusivity with DT (in my case). Port size around 900 photos and 100 illustrations:
SS - 50% acceptance (9/10 from the first attempt)
FT - 70% acceptance
123RF - 90% acceptance
IS - i never joined them.
Why not IS?
because i tried 4 times using the photos from SS attempt ( 9/10 accepted) and in the other attempts the best selling pictures from all agencies. I decide to not try again. The image reviewing criteria is paranoid, way too exaggerated.
If i will try again harder i will be accepted but considering the IS demands i will get accepted probably 150 pics , and considering that i am independent and port size they will show up at page 50 - 60 in search engine. Just not worth the effort for 14% commission.