I bought this because the WL-20 and the WL-20-L were not available. I do not regret it! I use it at home and in the rehearsal room, to get rid of the guitar cable. I was fed up getting my feet caught every time in the cable - now with the WL-50 it feels so good. Instead of the little dongle on the amp side (WL-20), I have now the small WL-50 box (even if I do not use a pedal board) standing at the side of the amp, with a 1 m cable to connect the box to the amp. To recall: the "Input" connector is only used when you connect the guitar by cable and do not use the wireless.
Only good feedback for the moment: Sound is the same as with cable, you can select the "missing cable compensation" with an off-short-long switch (I do not hear the difference with my old ears). The box needs a power supply, but the amp needs power anyway.... The advantage is that I have to charge only the dongle for guitar side and do not need the USB power feed. I can move some meters out of sight and the connection still works at least for 10 meters. The indication lights are quite clear and give good information, e.g. the multi-colour LED on the dongle.
One of the products that make you happy.
Update 15 April 2019: One risk point is that if you leave the dongle in the charging position, but disconnect the charger (for example for transport) . The dongle is active all the time and the battery may be empty when you start playing.
Update Nov 2019: I have now a pedal board, where the WL-50 is placed at the entry of the pedal chain - this is just perfect. I charge the dongle now with an USB cable.