I've had top notch service from phone agents. RUC/GUC, delays/rebookings, downgrade from middle seat Y+, etc.
However, Twitter [MENTION=12946]Delta[/MENTION] has been beyond terrible the last few months. I get the felling they've outsourced that service. Two weeks ago, my 1st of 2 flights was delayed and I was close to misconnecting. I asked twitter to *protect* me on the later flight in case I missed my scheduled one. They dropped my scheduled one and rebooked me on the second. I had to call to get them to correct it. Just be careful if you do something via [MENTION=12946]Delta[/MENTION]. Any agent who's been around more than a few weeks knows you don't cancel the original flights until it's 100% positive pax cannot make the connection.
Three weeks ago I'm on CDG-RDU and we wait 46 minutes for the first priority bag to hit the claim belt (regular bags started coming out at about 40min after arrival, still way too long). I send [MENTION=12946]Delta[/MENTION] a message to complain and they respond back an hour later with something like: "We see your bag was delivered, thanks for contacting [MENTION=12946]Delta[/MENTION]". Really? Then they send me a satisfaction survey...
Twitter [MENTION=12946]Delta[/MENTION] used to be awesome, now I'm afraid to use them. Actually, come to think of it, things got bad ever since they quit using [MENTION=848587]deltaa[/MENTION]ssist.