I used to use Wuala for soem backup stuff but my experience was similar to you. What's worse, the upload process was on hiccups every now-and-then despite of my strong and steady internet connection.
I've now switched to Mega. Check it out, it has 50GB free space, is encrypted and has an outstanding sync app. I am very impressed by it, synced my 8 GB data in couple of ours.
Same exact crap man. Yea I don't need much just important backup if a tornado hits the house ect. 15 gig is plenty for me and only use like 9 gigs on google drive web upload not app sync.