Extremely satisfied,This is one of the only inverters in its power rating that actually has an AC INPUT and fail over from that to battery, rather than just being inverter only, which is great! It also recharges batteries when connected to AC in, with a DEDICATED charging circuit enable/disable switch, which is important if you use non Lead Acid batteries! The quality / thought that went into this is much appreciated!I'm using this for a travel trailer that I'm building, to power a microwave and mini-fridge and small air conditioner unit, and needed the ability to plug in an external power source to pass through the current and recharge, and this is spectacular for that!I only wish I could turn off or adjust the low voltage alarm - I was using an undersized battery, 50ah to test it out, and ran a 700w/1000w microwave, and the voltage drop on the undersized battery was just enough to trigger the high pitched low voltage/low battery alarm until the microwave finished, even though the battery was fully charged and it was load-induced voltage drop. Even then... I understand, and it was due to my error in not choosing an appropriate size battery, so it alerted me to a potential issue, so in a way it was a positive.And on top of all of that, it's a pure sine wave! Awesome.Note : the picture doesn't do justice to how massive this thing is, it was much bigger than I expected, so keep in mind when planning for where you're doing to put it!