I've looked at various re-proofing products and chose the Grangers 2 in 1 because of the convenience of an 'all in one product', positive reviews from others and a very competitive price. I've proofed a very old Berghaus coat, a pair of trekking trousers and a three year old Berghaus coat. I did though follow others suggestions and thoroughly cleaned the dispenser of my washing machine to get rid of all detergent residue and I also ran a rinse programme with the machine empty. OK so now the results. The old Beghaus performed reasonably well in bad weather but wasn't made totally waterproof, particularly the arms and sleeves. I suspect that years of machine washing in detergent was the cause. However, the trousers, which had never been waterproofed before and the newer Berghaus performed outstandingly. So this product really works. I also checked prices of the Grangers at local specialist outdoor clothing shops. From Amazon it cost £6.00 with free delivery. None of my local retailers sold it for less than £9.00. So a great result all round.