WDHO, makes you accept something in Russian before the download, was even slower than Workupload.
UploadHaven, after 15 tries, didn't give me the link to the download, but to a file of 3.2 mb. Obviously malware. So, scam site. Reported it to Firefox even.
Mixdrop, even with adblocker and several other more aggressive security, always opens several tabs and tries to force download of strange files.
Workupload, I can only use it to download KoGa3 mods, when I'm caped on Pixeldrain, anything larger than 10 mb takes forever, in this case wait time was 2 hours.
YMMV, obviously, but I wouldn't speak up without trying and having clear reasons.
Peace