Product review (3 stars): CHEAP product but you can start with it and make it work.
Pros:

Well - it KINDA works.
Small

Cons:
CHEAP. The lid barely fits on there. I'll pay 30 bucks - just make it better!
Does NOT do a good job trapping lint. You'll have to Macgyver this thing for it to work.
You can't really direct the air - they have decided that the air will go off to one side and up top...
Did I mention Cheap?

I'm probably going to add a diverter to it too - get some flexibility. It's going to look pretty weird when I'm done but I like the fact that I can get some free heat WITH humidity back into the house in winter.