Nitro are cheap because they are Chinese imports. I had a f'glass Nitro and found the foam lining deteriorated quite quickly, meaning it was too slack on my head. This in itself shouldn't be a problem if you're buying with the intention of replacing your lid 2x or 3x more often and not just buying because you're too tight to buy anything else. Come on, be honest.

I found that it's biggest problem was that it fogged up far too easily, even with the vents open and was the main reason I stopped using it. The visor release mechanism is awkward and looks fragile and the vent fittings became slack quite quickly.

It's best feature was that it had a large aperture giving very good visibility but needed a strip of tape at the top of the visor when the sun was low. It was fairly quiet at speed and quite comfortable until the foam started to degrade.

I have a Nolan at the minute but I think the best helmets on a budget at present, only in my opinion of course, are HJC. I like the Nolan's but won't be buying a flip-front as most reviews state they leak badly. I'll probably replace mine with a Shoei flip-front as I also wear glasses. KBC look good value but I think the iridium visor should be last on the list of priorities in this price range.

As for the £37 lids, are these the ones that Aldi had in last year. B-Square is Aldi's own brand and while the gloves and underwear are OK, the helmets have been massively criticised by German bike mags. Motorrad said they couldn't believe they passed the minimum standards of the safety tests. Buy one by all means if you think your head is only worth £37!

I believe Arai have had a hand in developing the new safety standards that are coming which can't be a bad thing.