I have looked at Tintri off and on, have had a few conversations with a friend over there (who is probably reading this now, HI!). I still feel that the upcoming VVOL stuff will level the playing field from a Tintri UI/insight perspective. It sounds like a nice VDI box but outside of that niche I don't see it being a threat to any of the big players.
Per VDI it certainly would be nice to see some sort of standarization as to measuring the cost of VDI. all costs including servers, storage, hypervisors, OS licensing, support, anything else I forgot. Sadly it seems that every VDI cost analysis I have seen a vendor publish seems to have a unique perspective as to what they consider cost.