Yep, it’s ‘Diet’ for Men, black packaging and marketing based around ‘extreme’ stuff – caught Coke napping so they had a few years on them before Coke Zero came out.
They do taste different to diet versions, somehow they’re more Manly, somehow.
As for caffeine content, it’s actually a pretty useless way to get your caffeine fix. There’s about 8mg per 100ml in Cola, which is less than tea at 11mg, Coffee is the big boy – average is 40mg and that’s average including mellow birds and all that weak shit – and espresso is 200mg + in 100ml – stuff like Monster is 32mg per 100ml a lot, but nothing like coffee.