Does it work? Wow head seems to indicate its broken as of 9.1. Is it still useful in world pvp?
I use them all the time, still working as usual, along with the “fuel leak” and “explosion” malfunctions. This shares a cooldown with potions and other things if you are thinking of using this in world pvp.
They work just fine. Use them on this character and many others.
Heck yeah!
All my toons have it.
All my toons are engi 
And I am yet to see it malfunction in M+/raid. And I must have ran over 1,000 keys since 9.0 launch.
Sorta. But yes, it does put pots on cooldown, but only for 60 seconds. Learned it the hardway when I nitro’d to do a pack skip in ToP… lmao. But that was a long time ago.