I agree with the response time improvement. Nice to see the company placing an emphasis on taking care of customers who spend tens of thousands of dollars (and ++++) with it annually, instead of taking us completely for granted.
For a bit of a blast from the not-so-distant past, here's an automated reply I received from 1KVoice back in September 2013:
*** This is an automated response confirming the receipt of your email. Please do not reply ***
Please use this Case ID number if you need to contact us regarding this inquiry: XXXXXXXX
Thank you for contacting United Airlines. Our Customer Care team is currently responding to most inquiries within 14-21 business days. If your message is regarding an upcoming trip, a baggage delay or about our MileagePlus frequent flyer program, please refer to our helpful links below. We look forward to assisting you.