@Alexzn, Thanks for the comments.
Most of my testing was on groomers with a bit in some wet manky nasty crud-like 3-D snow... The un-groomed stuff had been rained on, and some nasty dirt and rocks were showing... Despite the snow not being much fun to ski, I didn't want to wreck my buddies $1,400 pair of skis. The tail still hung up though. I ski off-piste pretty similar to how I ski on-piste, so that is certainly a factor in my experience. Recall, I'm a Fischer guy, but that I ditched two pairs of the Motive 95 (one of the best, well-liked 95-waist skis of recent history) for the same reason. It is a great ski, but I didn't 'love' it. I do love the new MTN, which is almost the same ski as the Motive, with 5mm more width in the tip... go figure.
All that said, I think my experience plays into what
@Philpug says frequently... something along the lines of "there aren't many bad skis, but there are a lot of wrong skis." For how I ski, this isn't the right ski, but it is obviously the right ski for a lot of people based on how they ski. Given that you like a lot of the skis that I gravitate away from, probably indicates we ski differently... and based on this review, I'd wager there is a good chance you'd fall in love with the Z-90.
Looking at my list of skis that I ski regularly (below)... there isn't a single one that shares a similar shape with the Z-90 and I don't think that is a coincidence.