It really depends on your needs. I have found that if you are running something like a front-desk area in which you don't need to use a persistent desktop then this may be a good idea. For example assume that you have a public kiosk that many different people will use. After each use you wish to restore the desktop to a pristine state. This would be a good refresh case. There are other considerations such as how good/fast your storage is and how many desktops you wish to be available at any given time. How many refreshes do you expect to run at the same time and how often? There are many considerations. I suggest that you first outline your needs, look at your infrastructure and go from there.
I was faced with a similar situation for a training room. I had 22 desktops, but they were on an already loaded infrastructure. In my case refreshing often during business hours would not have worked well from a performace perspective. Your situation may vary.
