My Dropbox is very puny (a little over 7GB); my Copy is 60GB. With the limit now in place, I lost 10GB from two people here; one never installed the software and the other never confirmed their email address. Whoever you are, naughty naughty
Copy works a lot better for me now than at the beginning, but I think that's mostly because I slashed my library by about 80%. Also, their search function needs work; sometimes I can't find stuff I know is there. One time they updated the iOS app and removed the search function totally. I wrote and asked about it; I got a response it would be back in the next update, which it was, but really?