I bought this to dry my motocross boots and family shoes after washing.  It does exactly what it says it will do and dries boots and shoes quickly.  It was also very inexpensive, so that is needs to be recognized for my following comments, which might make it cost more and thereby less attractive:

1 - This is intented to dry four items.  If you are only drying one pair of shoes, the air is still going out the unused chambers.  My assumption is that it slows overall drying time because air will flow toward the path of least resistance.  Suggestion - have a way to close the usused dryers.  I simply took the boot attchments off and covered with a book.

2 - The product doesn't seem extremely sturdy.  For keeping it in the house, this is probably fine, but I am going to take it with me on motorcyle weekend trips.  I am concerned with it being packed up and moved w/out getting broken.

Again, if they added features and made it out of far sturdier materials, it might impact the price point.  As long as it holds up with a little care in handling, I am hoping this lasts for years to come.  My current approach after the first day of off-road trail riding on my dirt bike was to wrap my feet in garbage bags inside the boot to keep them dry.  There is no way soaked boots dry overnight on their own.