This provider is acting pretty good... I am getting some authorization errors every once in awhile. They don't stop the transfer, just sit there. I'll reauthorize because it's the only way to get rid of the message, but reauthorizing isn't necessary. I am getting lots of I/O errors, but I've upped the performance, so maybe that's to be expected.
After some trial and error, I'm using these performance settings (google probably hates me)
Upload/Download Connection: 200 each
Maintenance Threads: 300
Only uploading right now... always getting over 100Mbps, usually over 200Mbps, sometimes over 300Mbps. All in all, very good.