In Canada, at least, we need schools with central heating. Technology which causes more frustration than relief for the teacher. Technology which distracts from learning and adds to student's time spent staring at the ceiling. Technology which works mostly by itself, which does not require a Master's degree to operate, and which does not distract from teaching and learning. I would argue that there are some easily identifiable features which separate the good from the bad.
Good technology is always available.
This distinction is what makes buses, in spite of all their other advantages, bad technology. You can't always count on the bus being there. That's why people prefer cars. Good technology does not require scheduling, relocation, or set-up. Imagine what life would be like if we had to schedule our use of the elevator.