I just ordered two of these to go in a Bonanza.
https://www.ebay.com/itm/ASSIGNED-AL...QAAOSwRSBeE1Qo
It is equipped with a great, modern glass cockpit of PFD, ND and G1000 yet there is nowhere to rapidly and accurately record and display important values of flight such as assigned altitude. There are too many button pushes and knob rotations required. (Or pieces of paper with myriad ink scribbles then circled, underlined or overwritten!)
Here is an old school bit of kit that will serve the single pilot IFR operator well.
PG