Reddit reviews Smith & Wesson S&W M&P Lever Lock Cuff Nick

As /u/LadyLilithStJames mentioned, metal handcuffs have some risks associated with them. That's not to say you should never use them, just that you should be aware of the risks and learn how to use them properly (not too tight,always double lock them so that they don't tighten on their own during a struggle, etc)

You definitely shouldn't go cheap when it comes to handcuffs. I like the S&W Model 100 Lever Lock handcuffs. The main selling point for me is that the double locking feature uses a small lever instead of a pushpin or internal slide mechanism. This means you don't need to fumble around with the key to double lock them - you just slide the lever. They're a bit more expensive than standard police handcuffs, but worth every penny.