I actively manage 12 clip sites -
ManyVids is my favorite - hands down. I've been there nearly 3 years & have loved every moment, there's so many good things to say about this site.
For starters - its a clean, easy to use site with tons of features. Members tend to like higher quality vids & willing to pay a good price for them. Payment is always on time. MV has a good mix of things like preview & thumbnail generators + options to upload/customize your own. The online store option is also a huge plus.
Traffic is good if you have or when you gain a customer base, though I think I was lucky enough to start when their first page streamed just the recent uploads. They provide so many other ways to gain exposure though, through auto-tweet promos or entering in their weekly contests where your pic/profile is featured on the contest pages. I haven't done their scheduled live cam (one model at a time), but its more exposure as well. They also like to give shouts to models on their social media. It's not necessarily my highest earning site, but I do well there & I think it's entirely possible for anyone else to do well too with a good personality, a will to work & decent quality vids.
Support is always there whenever I've needed them. Pamela is the face of the site - she's a kick ass lady, super sweet & always available to help.
Side note: Non-premium members' ability to msg models stops after 30 days of purchase, so when orders may be late due to waiting on Amazon orders for customs, etc, it's difficult for customers to reach out to you & ask about it. This always seems to be a factor if there are store/customs issues.
MV is by far the best clip site around. To have so many unique & user-friendly features - store, private blogs to your fans, custom vid order forms, analytics, stellar organization to manage your business - it's really so much more than a clip site. The whole environment on MV is just amazing & would recommend to both newbies & pros - if you're not here, you're really missing out on the best.