Behringer DI20

Possibly one of the best price-for-value audio product on this whole website and in general. I love this DI box and all the additional functions like 2CH and link mode, it's extremely versatile, and it does the job more than good. You can hear a big difference in sound when recording or monitoring a bass or electric guitar through your interface if you insert this DI box before your Line in and for this money you shouldn't hesitate. If you're an audio engineer, even if you have more expensive DI boxes, this can make a great emergency replacement as it's unlikely you'll have any problems. I've used this DI box for home recordings, in the studio and live concerts on big festival stages - it's trustworthy and road tested.
I have two of them so far.

Generally speaking, Behringer is capable of creating great devices, and just because they are not always as expensive as expected it doesn't mean that they are bad. If you look carefully you'll see their racks even in Abbey Road so, if you want a piece of advice, trust your ears rather than internet reviews!

This little box from Behringer is a very handy addition to the home studio, mobile record rig or stage setup.

I have 2 of these and use them for live gig recordings with my mobile rig where I often don't know what I'm going to encounter until I arrive. These little boxes are very versatile and allow me to connect a wide range of instruments to my recording interface via balanced connections for best low noise performance with long cable runs.

For example, I've used them as classic DI boxes, to insert between instrument and amplifier and to simultaneously take a balanced line level output out to the interface, I've used a single unit to feed an unbalanced stereo output from a keyboard into twin balanced XLR inputs. I've used them to interface with a drum machine via the headphone output (the drum machines' main outs were broken).

They are powered via phantom power from the XLR connection or via 9V battery. You can connect instrument amplifier speaker outputs to them and use the inbuilt attenuator to match the signal. Other features include a ground lift, and the ability to use as either a twin channel single in single out DI box, or a single channel box with single in, multiple out.

Compact and lightweight, they seem rugged enough in day to day use, no issues with noise or build quality, and of course, excellent value.

To sum up, don't be put off by cheap reputation these are very versatile little tools and very competitively priced.

I carry one around in my gig bag since it is small and versatile.
There is one attenuation knob which acts on both inputs, so I primarily use it for stereo sources such as keyboards, tablets, laptops and DJ booth.
I have had mixed results with guitar/bass, the unit distorts to easy in my opinion, forcing you to pad the input even though the signal is not that hot.
It is not as well build as the DI100 (which you can throw from the top of a building and it will still work) and you should keep it away from mains transformers.
For the price, the size and the features it is a good unit.