|That "M" is meaningless in this case. Source.|
FLAVOR: It does taste like an energy drink. I have on occasion craved the flavor without wanting to stay up all night/risk immediate heart failure because I've already had an energy drink and like 3 Diet Cokes today because I had to be up before noon or something. So, this may actually be a good substitute.
EFFECTIVENESS: I'm about a third of the way through the can, and I think I do feel a little perk-up. Maybe it's the ox bile, maybe it's just a placebo thing where I taste those Monster-y chemicals and my body thinks it's time to wake up, but we'll see if it keeps going. Little while later, definitely doing something for me still.
As soon as I finished drinking it, I was tired again. Also, cooking is hard. I nearly took an after-dinner nap but then I knew Sleepy Hollow was on in like an hour and that's not really enough time so I opened a real energy drink. So perhaps if you aren't a caffeine fiend like I am, the "unleaded" will perk you up for an extended period of time. For me, any benefits lasted only as long as the drink itself.
Overall: not recommended if you're, you know, actually in need of caffeine.