Best way of detecting touch-enabled devices

Could be done with:

``` javascript
 // Detect Touch Devices
  if ('createTouch' in document) flag('touch')
  if (window.navigator.msPointerEnabled) flag('mspointer')
  if (window.navigator.msPointerEnabled && window.navigator.msMaxTouchPoints) flag('touch')
```

Any know issue with that? Is there another way?
