I've used sharp tests for a number of years when deciding on a lid quality vs. price.
For the first time ever, I bought something last year with only a four start rating... A scorpion EXO 400 (this one:
http://www.compacc.com/images/product/300/40706_3.jpg). The first and LAST time too. Where sharp showed its weak spots (at the sides), it really becomes uncomfortable after about 45mins to an hour in them areas. Have even contemplated emailing ol' scorpion with a complaint/ query as to the quality.
My misses, who seldom rides pillion these days with having two young ones at home owns a HJC rpha 10 (this one:
http://www.675.cc/upload/images/rpha10clubmimi.jpg and it is THE MOST COMFORTABLE HELMET I HAVE EVER USED... Would highly recommend this one to anyone. Only reason I haven't 'traded' lids is because I'd get a back hander off the boss
Apart from the two above, I can also vouch for Nitro - my previous lasting me a comfortable 5 years before deciding to renew (with the scorpion). Also have an AGV Stealth here which I've only worn a handful of times but I don't feel they're as comfortable as they used to be ten years ago - maybe my nose and chin have got smaller but I don't think they have!
The two biggest write off's I've had was with a Novak (remember them?) and an Arai Doohan rep - both were fit for purpose, or at least they've cracked before my skull with the Arai looking the worse off... Nice piece of gravel rash all along the left side with a sizeable crack across the back (phew
)
But yeah, with todays tech, we're mainly paying for the name or comfort of fit. Sharp is a useful aid in fairness but shouldn't be seen as conclusive, just a impact quality guide!
I'm not death to power tools... If it breaks, it's obviously NOT a power tool!!!