I like it, gross fast and gives the shrimp and fish hiding places. There are lots of other floaters out there, but I love duckweed. But once it's in your fish room, it is literally impossible to get out. It will always get in the tanks no matter what. So good luck, I like it!
My tanks (so far
5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)