I was considering replacing my small noisy bathroom fan and vent with a Fantastic Fan, but after seeing a review of the Heng's Vortex Fan Upgrade Kit (http://www.rvupgradestore.com/Vortex-Fan-Upgrade-Kit-p/31-5010.htm), I decided to try the cheaper upgrade. It took less than an hour to install and it looks great. The fan pulls a large volume of air (with the bathroom door standing open about 1 inch, the fan pulls enough air to quickly pull it closed).
The only downside that I can see is that it produces more noise than do the higher priced fans (but it is much quieter than the small fan it replaced). It is only a single speed and it would be nice to have a three speed switch to allow it to run at slower speeds.
Overall, it appears to be a good low-cost alternative for upgrading a vent fan (or adding a fan to an existing vent).
The only downside that I can see is that it produces more noise than do the higher priced fans (but it is much quieter than the small fan it replaced). It is only a single speed and it would be nice to have a three speed switch to allow it to run at slower speeds.
Overall, it appears to be a good low-cost alternative for upgrading a vent fan (or adding a fan to an existing vent).