SPAN panel....probably the best power device I have ever owned. Eventually, it will be my critical load panel as well but for now it has all of the analytics I could want. Replaced a 25-year-old dinosaur of an electrical panel that had a smoldering fire in it.
Second would have been my EG4 18KPV with a wall battery, but my first 5 days of commissioning experience have been very bad. Either I got a lemon or the firmware is not ready for primetime...still hacking away at it for now but going on day 6 and it still can do simple stuff.