Have not read of any bad faults with Tokina up to now, take a look at this link:-

https://www.dwidigitalcameras.com.au...ory=9&brand=60

I bought a 12-24 from them and ordered it months ago, took a long time to arrive but I can't really fault mine, not suitable for a "full-frame" camera but wonderfully wide if thats your liking and only about 2/3 the price of the Canon EFS 10-22
Richard