I'm a huge fan of my Aera 550 (have now added a GDL-39 as well, so I get free ADS-B weather displayed on the map). I've flown with the 550 across the whole of the USA, and also through much of Europe and most of Africa and it has been rock solid the entire time. The terrain feature is particularly good in places like Africa where VFR charts are pretty non-existent.