There are far better tests on the market than Sharp - it is massively flawed by all accounts, testing i n the wrong areas for impact. Provided you have BS or EEU markings (forget the Gold ACU label-it's for racing) then the lid is fit for purpose. As a guidline the more expensive the lid, the better the quality is likely to be. However, some budget lids (sub £100) are relatively good quality. Some folk swear by Arai, some Shoei, others Schuberth etc. Fit is more important than cost. If I were you, I would be looking at HJC lids, good price (even better if you can get a 'deal' on last years colours) and fit most folk. They are safety compliant with current regs. They are a US lid.