Still really like mine. A few new things have been rolled in like Airwave, and now monthly e-mail summary reports.

Can't comment on how two work together, I just have one.

Learning feature worked well for me, as it figured out my base schedule and when I tend to cool the house a little more prior to bed and raise it back up in the morning. Being able to edit the schedule on my iPad has been really handy, for the rare times I want to make a manual tweak. Auto away works well in my setup as well, for the erratic weekend or if I work from home a bit. No idea how it will work in your place, but it seems to be doing well here. It's figured out my AC system decently and shows pretty accurate estimates now on time to temperature.

And yes, you could just shut down learning entirely.

Attached is the daily energy report from my iPhone.