Product review (2 stars): Neat features but its drawbacks make it useless.
It works, and it's cute. However, the app is kinda difficult to use, you have to leave the device you're attaching to it in bluetooth range at all times for it to work, and whenever you leave bluetooth range, when you come back you have to restart the device before it will connect again. (So I can't set it up on my phone, because when I walk to the kitchen and back everything has to be restarted. I'd set it up on my tablet, but the Mesh app won't install on it.)

Also the device is battery powered and requires being charged: this isn't useful in cases where you have an application you want to run all the time. Like, I wanted it to monitor the temperature in my apartment and tell me when the temp drops so I can see to the furnace, which needs its boiler filled from time to time. (This was easy to set up: just set temperature ranges on the Mesh trigger and have it play a sound on my phone when it goes out of the temperature range.) This won't happen every day so the device will sit there doing nothing often, but I have to recharge its battery regularly. It ends up being more work to keep the Mesh trigger charged and connected to my device than to just walk to the basement and check the furnace daily.

Overall I'd say the Mesh tags are an interesting concept, but that they're more toys than really useful devices at this point. Great for a smart kid to play with several and figure out nifty things to do with them, but useless for real world applications.