Strengths: Light weight, feels like you are running on air but with great under support.
Weaknesses: Haven't found any
Overall: These were recommended and I would pass on that recommendation to anyone. Lightweight, supportive, nice & wide for when my feet swell on long runs and great for letting air through the 'mesh' front to cool down the feet. Thought they were quite expensive but in comparison to others - maybe not so.
Strengths: Had one of these before and one at 7 miles on the GNR when I was feeling alittle tired and soon came around again - not sure if it was the gel or if I'd gone through a 'wall' but whatever it was worked!!
Weaknesses: Taste was fine although I do agree you need a drink to wash it down with