That list doesn't mention bug fixes, which I hope is just an oversight, and that they will include bug fixes in this next software release (there's only TWELVE days left in September, Dish...)
The main bug for me is still the Mon-Fri timers. For the last few weeks, I've entered every timer as a one-time event, and it hasn't missed a single show. Now, that's great, but I'd certainly like to expand out and start entering M-F timers, weekly timers, maybe even just some auto-tunes. But at this point I wouldn't risk even trying anything other than single event timers. You'll never know which one it'll miss, and of course it'll be the most important one.
Otherwise, I'm liking the 721 much better than those first few weeks. But that's only because I'm treating it with kid gloves. Whenever I even get close to more advanced features (like recording 2 things at once while watching a 3rd from disk), it starts getting buggy. Last time I tried that one, the 3rd show kept hanging and freezing, almost like the hard drive couldn't keep up.
Plus there's a disturbing little "clicking" noise I hear from the HD once in a while....