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Join Date: Sep 2006
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The only difference between the 600 and 650 is the latter has a color screen instead of black and white. Both are only 5 device, far fewer than you had on your 688. But if you replace your remote in the 7.7 software, you'll get to keep all your old devices, even if you had more than 5. If you used sequences on your 688, you'll want to use the 7.7 software anyway, instead of the new myharmony.com website for programming.
If you like the 700 and need it's 1 to 3 additional devices, you can use regular batteries in it if you prefer. The rechargeables on the 700 are regular NiMH AA's and can be removed. But IMO it would be foolish not to use the rechargeables. Otherwise, you're just throwing money away on batteries.
The 600/650/700 still have 4 functions per screen just like your 688. The other 2 buttons below the screen act exactly like the top 2 buttons on your 688. So you're not losing anything.