Well it's common knowledge that this game has ability delay (especially in war zones at times)

http://www.swtor.com/community/showthread.php?t=141027

But does anyone specifically have ability delay with Sundering Assault? Majority of the time when I press it, nothing happens or when I do, it delays and my target changes position and then when it does react im out of range or the target is behind me. This is very annoying especially being full Vengeance spec and needing Sundering Assault to set up Shatter.. I'm about to respec Vengeance (23) Immortal (18) hybrid because of this issue. It gets me killed at times.