I picked up one of these off the local CL the other day for a decent price. I rationalized in two ways. 1. My youngest daughter (the doctor) is putting together a series of video trainings on various neurological conditions and issues that I am going to produce for her, and I needed a more portable way to record audio than my DAW, and higher quality than my camera. These are quite widely used for that purpose it seems. 2. I often don't record something I play or make up (and subsequently forget it) because my DAW is not up and running and I'm too lazy to start it up and use it. I need something simple sitting right on my desk to just press a button and be instantly recording something for future reference. After playing with this for a few days, I am super impressed with its versatility. It can handle any type of mic (4 channels, XLR or 1/4"), even provide phantom power while portable, has a variety of mic capsules that can be attached, audio quality seems very good, onboard color user interface including input mixer and mixdown mixer and VU meters, simple and very intuitive user interface very easy and quick to learn and use, line in, line out, headphone jack for monitoring live and playback, onboard compressor and limiter assignable to each track individually - and on, and on , and on - can't list all the features. This is a portable audio studio in a hand held form factor. You can overdub existing tracks. Oh, you can also use it as a front end interface for your real DAW via the USB output with individual tracks or mixed down (your choice). It will not take a guitar directly, but just running the guitar through some pedal will probably serve as an interface. I did test recording the line out from my Katana amp to it and it sounded great. I'm still finding new features every time I turn it on it seems. Quite a handy device if you can rationalize a "need" for one!! When you look at the pictures, it appears larger than it really is - it's quite small - fits in the hand nicely. I highly recommend it - a sweet piece of gear. For picture and more info, look here: https://www.zoom-na.com/products/field-video-recording/field-recording/h6-handy-recorder There are many yt videos showing it in action as well.