I am also happy with Dell support. I had a minor software glitch, and e-mailed them. I got a response the next day with some fixes to try, and if they don't work to let them know my phone number and a convenient time to call, A senior support Technician would give me a call, at my convenience, to handle the problem.
The e-mail also apologized for the 1 day delay due to heavy volume of requests.
Regards,
Jerry