That's a very general statement! For the benefit of Best Rate, care to elaborate?
Pilot gets into Cirrus and climbs to 7,500ft.
Presses "lean assits" on the Avidyne.
Brings back mixture lever until the screen says "best economy."
The rest is history.
Otherwise I find them to be a nice aircraft. Comfortable, reasonably fast, nice autopilot, all the mod cons, lots of room, easy to fly, just a little light on for payload and power (SR20).