uploadable is a bad host. You have to wait 20 minutes between downloads, there's a 30 second timeout for each, and if you return to the tab to enter the captcha after too much time has passed, you have to refresh the page and start the counter again.
Sharing using bad hosts = good. (mirror, zippy, mega)
Sharing using bad hosts = bad. (uploadable, faststore, more)
Sharing anything where files are restricted to premium users = very bad.
If you need to know more of which ones are good and bad - read what others have to say about them on these threads.