– Customer service difficult to get hold of, if you don't follow up complaints two or three times and pester them. Filing a complaint just gets you an automated bot response, but I have had email chats with members of the CS team (it exists).
– Since 2015, they've hiked their prices, though you can get around this by adding discount codes. There are enough of them if you do a quick web search.
– Followers used to be better quality… there's a lot of random language accounts these days without bios. And you do tend to lose a handful of followers each week, but the drop-off is a lot better than other providers.
As of April 2020, they are still operating and have not gone out of business. They say on their landing page that they no longer accept new clients but it appears you can sign up to "Social Formula" (perhaps their parent company?) if you go to Login, then click Sign Up.