I recently tried some. I tried to go 24 hrs on them alone. At 12 tabs a day per instructions. It was a lesson in starvation. I found it increasingly difficult to concentrate and thinking about food and distracted me tab. I gave in after 6 hours. I felt unsafe to drive the company truck. Man, that burger tasted great!. I felt Datex, Mainstay bars or Millennium Bars served me better when I tested them for 24 hrs. I think I would have to eat enough tabs to get at least 1000 cal a day. The serving size of 12 tabs is 240 cal, verses the Millennium bars 400. Common energy bars (Cliff, Balance, Lara, etc) often average 200-300 cal and I think provide more useful nutrition, variety, and take up less space. Meal Pack Bars http://www.mealpack.com/ are a little expensive but very good and gave me good energy.

I decided to pack Mainstay & Millennium bars in my vehicle BOB because they can withstand the heat. The tabs would work too, but I would have to have enough for at least 1000-1200 cal a day.

Oh yeah as far as taste the tabs tasted like sweet dry milk. They don't dissolve easily in coffee. Looking at the ingredients I think thats all they are is dried milk, sugar & vitamins.