The Mooer Micro DI is a good looking, super-compact DI Box which fits nicely on my pedal board. I use it to add a DI output to my Mooer VEM Box and it works a treat: the signal is nicely balanced, and with the -20dB switch engaged, there's a welcomed reduction in both hiss and feedback.
Aside from being a simple DI Box, the Mooer MIcro DI can also emulate the sound of a guitar amp (if the built-in cabinet simulation is engaged) allowing you to take your guitar signal direct into a PA without having to even mic up (or even use) a guitar amp. This is a useful feature, and might just save your skin if your amp unexpectedly breaks down at a gig. I haven't tested this feature though, and as long as I have realistic expectations - i.e. don't expect it to rival the sound of a high quality guitar amp - I'm sure it would do just fine.
The unit also has a ground lift switch, a balanced and an unbalanced output (XLR/jack), a -20 to +20 dB switch, and requires a 9V DC (centre minus) power supply to operate, which is not included. I power mine directly from my pedal board, and there is no noticeable noise or hum.
Overall, the Mooer Micro DI is a neat little product - it looks cool, it appears to be strong and durable (having been made mostly from metal) and perhaps more importantly, it sounds pretty darn good.