I'm not sure why, but I've never liked the looks of the Z-Point. It is just too plain, like having a toaster or mailbox on top of your rifle :wink: Plus, for the money you could get a tacticool Aimpoint or Eotech. That is just my personal opinion.
It looks like it would be a good sight and I can't imagine Zeiss making junk. If I recall correctly, I think the main complaint was that it didn't do a real good job of self regulating its dot brightness. I'm sure you can find all kinds of reviews on the net.
I like the size of it. It appears to have a very tiny set of backup sights on top. They don't really look useful, but that is one option for backup sights on a PS90TR.