I bought this DI box on a whim, another thing to add to my growing collection of recording gear. I've only recorded a couple of our bands songs with it so far but I am very impressed. The signal is clean with no sign of any hum or unwanted noise.
The pad switchs and ground lift are very handy, the ground lift in particular doing a very good job as and when its required. The filter works well, although I'll never use it, I always record everything flat. But again, no unwanted artefacts from using it.
The thru input is perfectly clean as well, me and our guitarist could detect no additional sound being caused by running through the box.
Build quality is good, it might not weigh anything but it feels like it'll last well and could survive a good few drops or being stood on etc. The only thing I would say, is the buttons could break off if caught the right way, but it would have to be a perfectly placed hit to do this and at this price it wouldn't exactly be the end of the world replacing the unit.
I really can't think of anything negative to say about this box, at this price it just can't be beat. There will be a couple of others added to my next order!