Did so too - two years ago already. With IceDrive I was waiting for a working Mac app for at least two years and was fed up with the constant promises without delivering anything useful.
Before that, after a year or so, I asked back my money due to the lack of a Mac app. But they refused since “I was using IceDrive too long already”.
Koofr has proven to be very reliable btw. There’s a 1TB LT deal at StackSocial(.)com. I bought it for $120, but meanwhile it is $200. Even so, it’s still a good deal.
For the time IceDrive will still exist, I will use it as a kind of Amazon Glacier.