Surprisingly useful! But could be better...,
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This review is from: Sony NT1 Smart Tag Kit with 4 Xperia NFC Smart Tags for Android (colours may vary) (Wireless Phone Accessory)
So I'm completely new to NFC technology, since I only got my Xperia Z1 about a week ago. I have to say, it's really easy to use and understand once you start. Just hold your phone close to one of the tags, and if it is your first time using the tag, it'll show you the pre-set tasks assigned to it. You will be able to change the settings though, so you can get the tags to do what you want.
You can get the tags to do a number of things on your phone. For example, I have one of mine to switch Wi-Fi off and to put my phone on silent, and then vise-versa when used the second time.
As useful as they are, I've found two small issues with them...
1. Even though most (or maybe all) of the functions that you want are there, there isn't a great deal available. You can only use the tags to change some of the most common settings like Wi-Fi, Bluetooth and Volume and to launch applications or shortcuts. This doesn't seem to be restricted to these tags though, as I had the same problem with the magnetic charging dock. It's not a big problem though, but it can be a little annoying at times when the function you want isn't available.
2. Sony phones (or the Xperia Z1 at least), have to be on and unlocked. If the phone is sleeping/on standby or is on but locked, NFC will not work.
At the moment, I think that some improvements could be made, but at this price, they are a steal, and it's a great introduction to NFC. They are surprisingly useful, but don't expect to be able to do a lot with them other than getting them to perform basic tasks.