A serious question......
I am in the market for a new helmet so just googled that Limar brand. They do look nice but are serious money.
The question is.......what will they give you for £230 that a £50 one wont give you?
I did look at some £100ish ones that have mesh inside as against the normal velcro foam pads. They were nice but I couldnt see £100+.
Good question and I'm not really in a position to put forward a technical case. My view would be they all perform the same basic function and imagine it would be illegal to sell anything which didn't meet a minimum safety standard.
Where I think one gets more bang for bucks is in weight, ventilation, internal fitting and external adjustment (I always get one which has the dial on the back to slacken/tighten while riding), style, comfortable straps, colour range and improved impact resistance.
How important people see these things is personal opinion. Last helmet I bought I took the advice of my trusted LBS and paid £100. One week later I crashed at 25 mph and it split in four places. I think my skull would have suffered without it and that £100 was a great investment. My LBS now stocks Limar.
I am going to get the Air Speed which you can probably see is £180. The club discount gets me down to £125 - over three years that's +/- £40. I've chosen this on the basis of comfort, fit, ventilation and looks. I'm a touch anal about feeling I look good on my bike. I wouldn't buy online without trying for fit first.
I ride 150-200 miles a week so all these other considerations are important.