I used to have a ME-RC50 which can be quite a hassle to use as you have to constantly click and scroll through menus to see the different inverter options and some options are quite limited (e.g. 30A). The ARC50 offers many more options and most notably a Favorites menu that provides quick access to the most frequently viewed parameter or setting. For a Magnum inverter, the ARC50 is a great unit and has worked very well for me so far. I would leave my rating at 4 stars rather than 5 stars though as the Magnum is better at handling graphics and also provides input/output current and input voltage measurements which you can get with a lot more on the Blue Power Panel. for Victron Energy inverters.
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