What more could you ask for the money?

For under 30 a set that works in both directions and can be used as a flash as well as a remote control. More can not be expected.
Previously, I had tested a iTTL cable in lengths of 5m, 3m and last one with 1m. None wanted the combination Nikon D3100 and Nissin Di622 combine working. But off-camera flash was important to me. This was then the reason to buy this set.

+ Simple operation: batteries in, switch on and get going.
+ Long range. Could not quite testing but 25m with reinforced concrete walls between them do not constitute an obstacle.
+ Transmitter and receiver are identical
+ Unleashes flash and camera remote trigger with just one device.

- Sorry, no iTTL transmission, so the flash in manual mode must be served. Does not bother me further, mostly Expose anyway manually
- Must be plugged to the camera to switch between the flash trigger function and remote release cable. An automatic recognition on the part of the Yongnuo products would be much more comfortable here.
- If you want to use the camera in automatic mode, the internal camera flash will fold.
- Instructions in English only (ok, you really need this not)

Conclusion: for under 30 really not wrong, but not quite perfect. Still very useful.