Product review (2 stars): Blowing off steam
I recently bought a portable dryer to use in my apartment and found this item while looking for venting options.  The idea behind this is great - the execution - that's another story.

The duct is flimsy and tore when trying to attach it to the dryer's vent.  The lid clamps are weak and have had pieces break off.  Removing the lid to the water well is almost assured of releasing the duct and I've seen stronger ties on a loaf of bread.

Now with that being said, if you are trying to vent in a small space without built in ventilation - this seems to be the only game in town.  The idea behind it is good, but I do wish they had put a little more effort into construction (for which I would have been willing to pay a little more for).