I thought I really needed it for reamping my guitar into pedals and amp, but then when I ordered it I tried it and found out, that I can definately do things without it and a lot of times reamping is more work, than just record again few times. Also, note that it's passive, it will not boost signal, the level knob only useful for dropping volume, Also, one of my friend, who does recording quite often, that you can do reamping without reamp box, and he showed me how he did it. So before, buying, do some reasearch and experiments and maybe talk to someone who knows stuff, to find out if you really need it. in the end despite, I'm not using it now, I didn't want to return it or sell, because I think it might be useful in future.
Other than that, quality is good, signal comes out quite clean, build is sturdy and you can open beer with it.