I bought Rockstar Energy + Guava drink sort of by accident...I was in Asda with my husband picking up a few bits. I had a £10 voucher and wanted to spend it, but when we got to the till I was £1.20 short. So I ran to the drinks aisle, saw that Rockstar Energy drinks were 98p or 2 for £1.50 and thought 'bingo!' and picked two up.

I had always thought that these beer-can sized, punk-styled drinks were for teenagers, and dismissed them for that reason really, plus I do think they're pretty expensive at 98p (but not bad on offer at 75p considering a much smaller can of coke is 60p).

So, the one I went for is Rockstar Energy + Guava which is in a dark purple and gold can. It's 500ml in size and states on the can '10% Juice'. The acutal flavour is 'Guava Punch Flavour' and around the rim of the can it says 'caffeine * guarana * ginseng * b-vitamins * taurine' (which is very similar to the ingredients list of Red Bull).

In terms of caffeine, this drink has a VERY high amount - 160mg in the 500g can, as opposed to 76mg in a 250ml can of Red Bull. I would not advise you have more than one can a day, as if you drink tea and coffee you would exceed the recommended daily amount of caffeine for an adult (500mg). As an energy drink therefore it does do it's job - it's great if you're feeling a little sluggish or you are taking place in a sports event, or going to a gig. I really do think it perks you up. I would be wary however if you have a heart condition, and I wouldn't give this to children, in the same way that I wouldn't give a stimulant to anyone without using caution.

So, the drink. It's a very 'normal' looking orange - the colour of juice - and though it is stated on the can it is lightly carbonated it's not in any way fizzy (which I think is best). There is a 'pzzzt!' when you crack open the can, but this is not a fizzy beverage at all. It smells very nice, like guava juice with the merest hint of Red Bull. And that's pretty much what it tastes like. I have to stress here, it tastes far more fruity than of energy drink, and if you don't like Red Bull, don't let this put you off because the taste is a lot more mellow. In fact, if you want the energy boost of a caffeine drink without the very 'Marmite' (ie, you love it or you hate it) flavour of a plain energy drink, I would absolutely recommend Rockstar as the way to go.

So, the drink went down very nicely. It tastes best straight out of the fridge, though it is actually on the shelf with the rest of the energy drinks in the supermarket, so you can't really buy it from there and drink it straight away (unless you like slightly warm juice, I don't!).

The drink isn't one I planned on getting, and like most things I end up liking, I came across it almost by accident. But I really did enjoy my two cans of Rockstar Energy + Guava and will certainly be buying it again for a treat now and again. I wouldn't drink more than two cans in a week as I don't want to become dependent on the caffeine boost, or over-indulge on caffeine, but as an occasional treat it is just the ticket. I recommend this, and I'll be trying the other flavours in the Rockstar range.