"Good support" is a pretty vague term, so I'm not sure what you mean. But you get a SLA and 24/7 access to support. Not sure what more you're looking for.
I've never needed support from Google so I can't speak from personal experience, but I've read many blogs and comments here on HN complaining that paying for gmail ought to mean good customer support, but in fact it's just as bad as it is for free users.
I'm in bed on my blackberry and about to drift off, so I can't be bothered to find examples. Will take a look in the morning.
There's a common confusion between users "paying for Gmail" by buying more storage and "paying for Google Apps" which is what comes with the SLA and support. Buying more storage simply gets you more storage. I'm sure there are horror stories from actual Google Apps customers, but that's surely the case for any company with tons of customers.
