Well, if you read the Philadelphia Inquirer and listen to KYW 1060 you would certainly believe it is. There is a real push by Tempe to get the word out in Philadelphia that things are better. They have people on the radio saying, "It only took 20 minutes for my bag to arrive".
I have seen improvements. There are still ridiculous delays with bags every now and then which is much more infrequent than before. I find most of the people to be nicer as well.
PHX is worse than Philadelphia in my opinion. I have found the majority of ticket agents to be rude (and when they aren't, they are VERY VERY NICE). Not a lot of middle ground in my opinion. I find the bags to be delayed as well. Lines are ridiculous for ticketing and half of the people working there don't know which line you should be standing in, yet, they will BARK at you telling you stand somewhere you ultimately find out you shouldn't be standing.