TLDR-Dropbox works well and fast while Google Drive is (currently) snail paced.
The desktop client is startlingly slow. I've spent hours watching it slowly creep along with the huge pile of files I have. It's also reporting that it is having a problem uploading files. Files that are perfectly good and will upload when you tell it to try again. Restarting the App, restarting the computer or having no other activity on the computer and network make no difference. I can't understand how a company with as many server farms and knowledge of data storage, transmission, and tons of fiber can think this is a product worth paying for.
It's just bad.
I guess I can kiss that $5s goodbye.
Sorry Google but I won't be sticking around waiting for you to do what Dropbox already can do and MobileMe did years ago.