After a year, when you fancy a flip down internal sun visor, change of colour and an anti-fog main visor. I bought my previous helmet (cheapish Takachi TK30) when learning to ride and didn't want to spend a lot only to find biking wasn't for me. Now I know I'll be doing it for the forseeable future I could justify a slightly more pricey lid.
BTW, Just 100%ed Midnight Club 3