The speed isn't a challenge. The avionics are. Cirrus avionics are complex and when I do transition training with students we'll often spend at least 3 lessons on the ground with the plane plugged in and moving buttons. If you don't know the avionics and you're cruising at 180 knots then it can be a problem especially if you're ifr and trying to fiddle with the screens
How is the G1000 in a Cirrus more complicated than the G1000 in a DA40 (a dedicated trainer) or a 172 (a dedicated trainer) or a SR20 ?