I honestly hate the ifd system. The buttons feel cheaply made ( like they will tear with a finger nail). The controls dont feel intuitive. Their touchscreen is kinda wonky. I would hit something and it would select something i didnt hit, ( this happened on the show floor model and in my friends plane). And the graphics/ what is displayed on the screen itself looks cheap, though that is extremely minor. I love that they are a slide in replacement...for the most part, you still might have to do wiring. I do like that you have the option for both touchscreen and knobs since you really need to use the knobs on the device. Lastly, i LOVE that you have flightplan transfer (Bluetooth) built right into the unit!! Unlike the 750 where you have to buy the 510 to have it.
I went with the 750 in my Mooney. It is easier to use, better quality, oh and the ADSB weather is a LIFE SAVER. If you have ADSB-in, the weather capabilities on the GTN-750 is the best. You get so much knowledge at your fingertips. Ill see if i can get a picture of it later.