I use the $20 grid account for one of my clients and its been an up and down experience... more ups then downs I have to admit.

I've had issues with:
Email: smtp really slow to deliver mail... like sometimes up to 24 hours after sending.
Sessions: randomly losing visitors sessions.
Server: randomly the server slows to point that a page load which would normally take 1 second to load suddenly refuses to load under 10 seconds.

Sessions issue got resolved, the other two are still outstanding and the account is about 8 months old now.

Going to go check now if I can access my databases... all i need is another issue...