I upgraded using the Dishin it up from a owned 625 to VIP622 last december. I was thinking that since I had been with Dish for like 7 years that I would get a really good deal, maybe $50.00 out of pocket max...I was wrong...I had to pay $149.99 and get back into a contract for 18 months...I could have gotten the 722 for $199.99 but was new to the whole HD scene, so I just went with the 622, you will end up getting it refunded it back to you after you get your first bill that shows you have the qualifying programming to be eligable for the rebate...they offered me a $10.00 credit for 15 months, but to tell you the truth I forgot all about the rebate and havent bothered sending it in.
Hope this helps, there might be better deals out there now, if your contract is almost up, if you have one that is, try the retention department and tell them you want to switch providers...you would be surprised how far that can get you from what I have read on here...something else I wish I would have tried...LOL
EDIT: If you infact own your 625, they are gonna try talking you into sending it back to them...DONT, they are only gonna give you $5.00 for it...I kept mine, you never know when you might want to add another outlet...or EBAY that sucker, I have seen some pull well over $100.00 on there, used