Alternatives to Nest
Yeah.... Honestly, the Nest thermostat isn't really panning out to be nearly as good of a product as most people thought, originally (myself included!).
I give it props for the physical design/styling, certainly. But a major flaw is surfacing because it eliminates the traditional mechanical relay switches inside for switching transistors on a circuit board. These transistors have been failing occasionally, causing problems like someone's air conditioner "short cycling" on and off repeatedly. If it happens when the owner isn't home to catch the problem -- they can easily wind up with a damaged A/C compressor costing well over $1,000 to repair. (Nest will happily send you a replacement circuit board though at no charge.)
In other cases, the transistors in the Nest fail in the "on" mode, causing the furnace or A/C to run continuously.
There's a lot of blame going around right now around it using "poor quality Asian components". But at least one HVAC guy I read explained the real issue lies with the contactors on the A/C, heat-pump or furnaces themselves. Basically, they start to wear over time and draw more power than they did when they were new. Eventually, they start drawing more than what the specifications claim is needed, which is more than what the switching transistors in the Nest were designed to handle. This never used to matter with the old-fashioned thermostats with mechanical relays because those handled the extra power draw just fine.
For what it's worth, I just bought a couple EcoBee thermostats, after a lot of research. EcoBee is apparently a Canadian firm who only markets its digital thermostats to resellers, not end users. But most HVAC people familiar with them think very highly of them, and recommend them over a Nest.
EcoBee has a web portal to do all of your thermostat programming and monitoring, and has an iOS app just like Nest does. The thermostat itself even shows you the current weather conditions outside on its display and is intelligent enough to make adjustments based on those conditions (humidity levels, etc.).
This is why I recently purchased a Honeywell thermostat. Yeah it doesn't do all of what the Nest does, but it's enough. And Google won't know when I'm home or not.