I had never heard of it, but a quick google brings up the official page, which touts "meal replacements and diet products." On the surface, at least, it looks like one of a thousand other similar plans out there.
Meal replacements are not an ideal source of regular nutrition. They are effective in that they do help you restrict your calories within the desired range with little to no work on your part, but that has its own disadvantages. While they may help you learn a little about appropriate portion sizes, they teach you nothing about preparing them yourself. Once you stop paying Exante, you're on your own. They also tend to be high in sodium and comparatively nasty tasting.
I'm not sure what "diet products" includes, but I'm guessing supplements, which aren't necessary if you're eating properly to begin with. I don't know about the UK, but in the US supplements are virtually unregulated in terms of efficacy. The vast majority of them do absolutely nothing but dissolve your money. The extremely rare examples that *do* work as intended usually turn out to be dangerous. To be fair, in briefly perusing the Exante site, I didn't see any such supplements...just tons and tons of foil-wrapped packets that look like MRE's and astronaut food.
Honestly, even with a groupon, it seems like a ripoff. Even if you're really in the market for a new brand of hyper-processed granola bars and diet shakes, it doesn't offer anything special. You can make the same sorts of products at home for less cost. They'll taste better and be more nutritious, too. And if you're in the occasional pinch and need a packaged food to help with time, there are probably cheaper and equally useful products available in your regular grocery store.
Edited by: BITTERQUILL at: 6/17/2013 (11:23)