Product review (3 stars): Cheap in every respect, but it works.
This thing is about as cheaply made as you can get.  The plastic trap/bucket thing is made out of cheap plastic, the dryer hose is super short, the little zip ties they give you to connect the hose to the trap are garbage.  However, when you put the water in it, it actually works surprisingly well to catch lint and even some of the humidity.

I am having to do some work on my house and lost the connection to the dryer vent outside while it is being completed.  For this kind of limited, short term purpose it is fine (just go to Home Depot and buy proper, metal dryer hose clamps - save yourself the aggravation).  I think this is for long-term use only if you are desperate and can't do anything else.  It is better than just leaving the back pipe open and pumping moist air and lint all over the room.  But not hugely better than that.  You have to monitor the water level and periodically empty out the lint from it, which is a hassle given that the thing has to sit right next to the dryer, in the back, on the floor because the vent pipe is too short to reach anywhere else.  Again, if I had to use this for more than a month or two, I would invest in a longer, better made, metal vent pipe that lets the thing sit somewhere where it is easily accessible.