Product review (5 stars): Amazing Product!
I have now had the Purewash installed in my home for six months. I was skeptical at first. I tried a full load of towels in my front-load washer using no detergent and no softener. The towels came out clean and smelling VERY fresh. Since the smell is not an artificially added smell, it actually lasts longer than if you used a scented detergent or softener. The first time is used one of these newly cleaned towels after a shower it was like I was using a brand new towel. I was more absorbent than it previously had been and also seemed fluffier. Six months in and we still use no detergent, softener, bleach, or hot water.

One of the big things that interested me in this product was that it could eliminate foul smells in the washer. I tend to forget laundry over night, and it always came out smelling rank. I tested a load by leaving it in the washer for two days straight and it came out still smelling fine!

Pros:

Cleans well (stains do need to be pre-treated, just like normal)
Clothes smell VERY fresh afterwards
No (or very little) detergent use
No hot water use
Easy installation
No more smelly washer
Towels dry like new
Clothes last longer

Cons:

Slightly louder operation than I imagined (still quieter than a washer though)
Some loads will still need a dryer sheet to combat static. I wear slacks and button down shirts to work every day, and if I don't use a dryer sheet these clothes stick to me and attract every bit of lint or hair imaginable. I don't know if this is due to the Purewash or not, as I had always used softener or dryer sheets before, but once I stopped when I got the Purewash, I immediately had to go back to dryer sheets.

Overall, this unit is well worth the money just in the savings from no hot water or detergent/softener/bleach use alone. Add in the fact that towels dry better and it is better for the environment, and I can't imagine not having one of these in my home. If this one ever quits I will immediately purchase a replacement. Amazing product.

Update: 6/20/14

After having this product for almost two years, I still love it as much as when I first got it. My first unit did develop a small leak, but Purewash sent me a new one. I have solved the problem of static by simply adding a small amount of vinegar to loads that I know will be problematic. This does a very good job, and does not leave behind any residual smell. Plus it is safe on clothes and the environment. Still love my Purewash!