My Bell lid was best part of £300 when I bought it (3 years ago).....and it still fits really well.....is really light.....so it's comfortable to wear for long periods of time. This is by far the best lid that I've owned in my motorcycling career....with the only downside being the wind noise...... I think with the SHARP tests they look at the effectiveness of the internal protection (Shock absorbtion) and also the shell integrity with impacts from different angles.....so I'm a bit of a fan of the SHARP testing.....and, as has been pointed out, the 5 star lids are not all high-end lids.....there are plenty of lids in the sub-£100 bracket that get 4 or 5 stars.....