I love mine. I wouldn't pay $700 for it, but I'm frugal. There's a guy on ebay who is an authorized Line6 shop who sells them for $599 plus shipping. I got mine new in the box from another person on ebay for $495 plus $14.50 shipping and $3.00 insurance and had no problems registering it with Line6.
It's very, very versatile, and I've spent a lot more time playing since I got it because of all the tones that are available to me. The only difference between the POD XT Pro and the regular POD XT is the interfaces and the rackmount ability. The regular POD only has the midi-in & out, USB, and 1/4" phono in/out connectors. The Pro adds XLR and digital connectors plus rackmount ability. The amps, cabs, stomboxes, effects, and ability to use amp packs are the same. If you don't need the rackmount ability and the fancy connectors, save your money and buy the regular POD XT for $299 and get some other gear.
Remember the Alamo, and God Bless Texas...