I've had the Etaker F2000 about one week, and it has shown itself to be an extremely versatile charger, perhaps the most versatile one on the market.I use my truck primarily for camping, and I've got a combination of 12V and 24V devices, including a 12V starter battery and a 24V auxiliary battery. I've also got a power station (EcoFlow Delta 3+) that I use at home for backup/emergency use, and while camping for AC devices (like an induction burner). I've also got 350W of solar.Ideally, I was looking for a device that could do perform all the following functions; I wasn't sure such a device exists:1. Support charging the 24V battery from my truck's 12V system.2. Reverse charge the 12V starter battery in case I accidentally let it run down; this would prevent me from being stranded on a remote camping trip.3. Charge either battery (truck or 24V auxiliary battery) from solar; not essential, as I already have a separate solar MPPT charge controller, but this could reduce the equipment I bring.4. Fast charge my power station.Until I discovered the F2000, the closest I found was a DC-DC/MPPT charger from Renogy; it works with both 12V and 24V batteries. It's not ideal for fast charging a power station, as it's limited to 24V and not really designed for that purpose. And it's reverse charging capabilities seem limited.I'm pleased that the ETaker F2000 can perform all the functions I needed. But wait, there's more!It turns out that all four ports (car input, solar input, DC output, and a proprietary port for ETaker power stations) ; I cannot test this last one) are bidirectional, meaning they can be used as both inputs and outputs, and each port can be set to different voltages.So my 12V truck can charge my 24V battery, and I could even use the "solar input" as a 12V, 24V, 36V, or 48V output (make sure you don't have solar panels when using that port as an output). That means I could use my 24V battery to power a 48V air conditioner like the Zero Breeze Mark 3 (I don't actually have a Zero Breeze, so I haven't tested that exact scenario).Or, I could disconnect the F2000 from my truck battery, and still power my mix of 24V and 12V devices I use while camping. There are too many combinations to list, but in short, you can convert to and from any mix of 12-48V across 3 ports (the ETaker port, I believe, is fixed voltage).The app (Smart Life) is pretty good, but not perfect. My main complaint, which isn't a huge one, is that it updates the display infrequently, maybe once a minute. So you won't get a real time solar input wattage, for example, and when you activate a port, or connect something to it, it'll take the app a while to reflect the current, voltage, and power. That hopefully will be addressed in an app update.My second complaint, which I also hope is temporary, is that while the device has an "Alternator Status Detection" connection (to detect when your vehicle is running, instead of relying only on voltage; useful for vehicles, like mine, with a smart alternator), a wire for this connection is not provided, nor is it documented in the manual. The app does have an "Alternator status check" setting, so it's hopefully just a matter of time before ETaker offers a wire/connector for this port.Overall, I recommend this product. I can't speak about it's long term reliability yet, but it suits my needs, and is versatile enough that it should work for just about anyone comfortable with automotive wiring.