Product review (3 stars): It's OK ...
I bought this based on the reviews as our previous dryer booster fan died.  I thought we would try this one bc I wouldn't need an electrician to install it & could probably save myself some $$ by installing it myself.  Fairly easy to install although had to brainstorm on how to wire the piece that goes into the vent hose bc there was no other way that I could get it to stay (tried duct taping & that didn't work ~ finally had to "wire" it in).  However, I don't think this dries the clothes anywhere near as quickly as our previous dryer fan vent did.  It helps to a degree, but certainly not any miracle cure or anything like many of the reviews said.  If I had to do it over again, I probably would've gotten a duplicate replacement for my previous fan, paid the electrician & saved money on the back-end by having my dryer run less overall.  It's ok, but not great.