What do you guys think of the new psion trigger? Is it on par with psiblast, or would you just let it collect dust like the riding skill?

It depends on your psionic build, if you do one aimed toward killing individual mobs with and having more damroll such as Psi/Monk it's not very useful. If you're using a caster multiple mob build such as Psi/Phy then it is quite useful, especially in areas such as hell. It's a nice addition in my opinion.

I use this ability all the time, thanks to the coders for putting it in.

When yer hit with it you get a message saying something like you grab yer head in pain and fall down. Yet, it does no damage. It should do damage. In fact, at gen what, 7? it should do psiblast caliber damage. I rarely use it.