I have search and asked and have found that 99% of the people who have purchased them are satified. the one that are not are not using them properly we are in the process of raising money to by one or two to use in our mission in the Philippines to restore polluted deep wells back to potable condition.
I think you will be satified with your purchase. look for a post by Mrs Jones she has explained all the pros and cons and what the difficulties are. I will try and find it if not i will post a copy of it in this thread.