I have done about 1300 hours dual given, half in glass (Mostly Cirrus). The students who try to learn in glass GENERALLY are very distracted by all the advanced technology, and in the case of the Cirrus, generally take twice as long, or longer, to finish the private pilot certificate. I won't instruct any more primary students in glass, and I tell them why. They can do the private in a 172 or and Archer, do a Glass transition, and still stuff $10,000 worth of savings in their pocket!

My experience has been that Instrument students do fine with the glass transition, but it is generally not a good idea for the primary student. Just my opinion after watching it for a few years.

FWIW, guys who only have glass time are typically lost in our Navajo and King Air.