A good experience, however, I wish a sample of a potential purchase could be supplied before making a purchase . Alternatively, the sample could be supplied with the purchased item, so that it could be tried, and if necessary, returned; but this would make it a tedious exercise. Or, a sample could be supplied for testing, and the main product could be held back against payment made for the item, pending approval by the customer after testing. Its upto you how you would like to work it out.