This is what I see as the greatest benefit, not having to look under yoke (current position of JPI 700), or over to the right where it would be possible to fit in the 930 screen. Doing the split screen: map/MFD, PFD, EIS right in front is pretty terrific. Should it fail and I am left with using the backup GI-275 for the AI/speed/alt to get on the ground, I am pretty comfortable I would be able to manage the engine by sound and habit. Going down is mostly about not shock cooling, bringing the mixture in... and avoiding the MPs getting too high. If I had to, I think I could manage that. Not sure but if you can grab data from the TXi onto iPad, you have some numbers like fuel to look at as you make your way to the ground...
Swapping KFC150 with GFC will come later. KFC 150 is rock solid and can be driven by GI-275 or TXi and setup with it's own Garmin controls as well.