Product review (4 stars): ... for a few weeks and found that this is super helpful if you do not have laundry onsite or ...
I've used this product now for a few weeks and found that this is super helpful if you do not have laundry onsite or camping.  While it doesn't get it as clean as an automatic washing machine, such as getting out stains, it is perfect for getting out the general every day "grime".  One of the key features is the hand crank that takes this washer off grid and usable anywhere.  I thought it was going to be hard to crank this for 2-3 minutes but it is incredibly easy.

Cons: The drain is slow due to it being covered by the laundry, so lifting the laundry will increase the speed.  Laundry is soaking wet and if using hot water as directed it can be a bit to hot to touch.

I found using products that are detergent additives, like oxi-clean do a really good job to get that extra boost of clean.  I did manage to get a grass stain out after pre-treating and washing it twice at 2.5 minutes each time.