User blog comment:Emptylord/Champion reworks/Udyr the Spirit Walker (2013)/@comment-4068613-20130605084717/@comment-3974211-20130605112851

You'd never be able to get 60% bonus movement speed while stealthed. The maximum movement speed is reached after 5 seconds, and Snake's Guile will only last 3.5 seconds.

However, the general concept of a stealth-gap closer is no different to Decoy+Nimbus Strike or Deceive. Although it is the only hard CC (excluding Shaco's Box which has an arm time). Udyr will become visible the moment he starts charging, and since it's a fixed range dash, champions with a dash themselves can place themselves away from him.