I have been a very big fan of Forma helmets since I have seen numerous Indian players being hit on their heads by some of the scariest bowlers around (e.g. Sachin by Shoaib Akthar, Brett Lee and younger James Anderson), Sehwag and Laxan by Brett Lee & Saurav Ganguly by Dale Steyn. All of them came out unhurt without any major trouble. Rahul Dravid after breaking his jaw against a Bangladeshi quick also switched to Forma. It makes sense since Forma (owned by Pro-Tech) is a major road safety helmets (for motorbikes) manufacturing company in India & the roumor is that original Forma cricket helmet (the looks of it) was designed by the great Sachin Tendulkar and Kiran More (former Indian national wicket keeper). Mr. More still owns stakes in the company. No wonder many Indian international players use this brand.
Anyway, the point is asking is it is quite safe to he it but on the other hand, their ventilation is horrible! There are three holes on the top of the helmet and they don't help you cool down at all. Someone like me who sweat excessively higher than others, this is a massive discomfort! During a longer innings, I literally have to take it off every time I reach the non-striker's end!