I really love these individual solar lights. I can't comment on the longevity yet, as I've only just had them. I can say that they pack quite a punch, and have given a dark patch to my back patio some much- needed illumination.
I like the fact that, unlike some lights, they hang nicely onto the heads of pre- drilled screws.
Some of mine are in positions not really conducive to direct sunlight ( like under shed guttering, for example ), but even during the darker nights, they've worked flawlessly.
Yes, they are more expensive than some lights I've purchased, but there's obviously more premium quality solar panel and battery in these.
I would happily buy more, and I absolutely love the personal touch of the tea bag and biscuit with each order. I think that speaks volumes about their dedication to customer service.