OK, so here are a few subjective observations from a current Airways customer. I use USAir exclusively now to DH to and from Purple assignments. I will say a couple of things, from the customer's perspective, about these changes.
Baggage fees. I pay them with the company card so there's no impact on my travelling USAir from that perspective, however I have noticed one important improvement. The time to get my bag at baggage claim has improved incredibly. PHL, CLT and PHX have all shown vast improvements in my experience and we all know how bad PHL and CLT were in the past.
Drink fees. Coffee is a buck with free refills (I don't like soda). The nicest part of this is that the FA's want to get rid of the leftovers, whether they dump it in the lav or pour refills. I have noticed that they are much more attentive and responsive to customer needs in the cabin.
Again, this has been my experience in the last month or so, but I have noticed a change from the customer's point of view.
Your mileage may vary, but I will continue to fly them for work purposes. I stopped using NW and others a year ago and haven't looked back. For leisure travel I'm still driving. Now if they could only work on their on-time/lateness we would really be in business. All-in-all the airline is providing an improved product from my perspective anyway.