I have the 650 and as others have alluded to...it constantly resets. If it falls more than 6 inches and makes contact with any surface (even a couch), it will reset and you have to hit about 10-12 buttons to get it back to functioning...not a big deal if it happened once a month or whenever the batteries were changed, but it probably happens at least every other day...takes all of 20 seconds, but still annoying for a $50 remote (got it at BB on black friday).
From what I've heard the connection with the batteries to the unit isn't very sturdy and these sudded movement cause it to lose contact for a split second and you then have to go through the reset process....I've heard you can shove something in there to prevent the batteries from moving, but I've yet to try it.
Good remote otherwise for the most part, but occasionally it will not turn on/off a device the first time and you have to hit the help button to make it perform the action.

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