there's no odor to the product at all...that's part of their list of "benefits".
I can say this after using the product for about 1 month: It works as advertised. It does a good job on MF towels. I also have the Micro-Restore product and the Pinnacle equivalent - - I consider these two products to be equivalent. The dedicated MF restore products do offer superior cleaning performance on very dirty MF towels compared to Charlie's. I believe they leave the towels a bit softer, too. I think the dedicated MF products do a very fine job but they are costly, IMO. I typically use them every 4th wash or so unless I have very dirty towels.
The Charlie's soap doesn't appear to clean quite as well but it does a darn good job and at a fraction of the price.
I am using Charlie's on household laundry. It works well and leaves nothing to be desired UNLESS you like the perfumed scent left by many of the mainstream detergents. I use the prescribed amount which is 1 oz. per load of laundry. It cleans very well, clothes are soft, there are no odors, cost/application is LOW. It's suitable for HE and conventional washing machines.