QUOTE (Hawkmarty @ May 19 2009, 01:43 PM)

Hi I have had a Harmony 659 and have been generally pleased with it upto now.
Unfortunately it has lost functionality in some of the buttons so am looking for a replacement.
Should I go with a 525,785 or Harmony One ?
Depends on how much you want to spend. I have a 520 and 525 because I could not justify spending 2/3 times or even higher for the other models. I was happy with mono, no favourites button and using batteries (maybe 12 to 16 a year). The 520/525 "feel" could be better but have got used to it.
As you already know, the power of the Harmony is its ability to control multiple devices and switch everything on to exactly what you want it to be. The 525 will do all of this. Other than more activities, the premium you pay for higher models does not significantly add to this controlling capability. But then, lots of people here are prepared to pay for the higher models.
My suggestion is to do a compare of the website, then go into a store and try all three. Ideally, you should try it with them powered, but there are not many places which allow you to do this. The 525 will feel the flimsiest and the One will feel the best. Then it becomes what you are prepared to pay versus what you desire.