They are so expensive, I've been using aloe Vera gel but Nuface have now come out saying using aloe Vera gel means the device will only work 'superficially'. Which it kind of does anyway? So is this corporate gumph designed to enslave you to their horribly priced gels, or is there something in it? Nuface users, do you all use the Nuface gels and if not how have you got on with the alternatives? Thank you!