I got these soon after laughing aloud in the face of a sales clerk at Covent Garden who offered me wraparounds very similar to these for £100. It was rude, I know, but I was surprised and shocked! My last sunglasses buy was about £5 from Lidl a few years ago but that pair had been sat on too many times and the cellotape keeping the lenses in was really quite tatty.
As others have said, these are light, comfortable and strong. Admittedly, I am boorish in sun glasses shops and careless of my appearance, but I can discern no significant style downgrade over their £100 or Lidl cousins. My only complaint is that the lenses are a bit dark for this climate but not so much as to send me looking for another pair.
Getting on to a year later, I like them even better!
Used these for work and used them for cycling. They are light and comfortable. Occasionally - if you sit on them for example - the lenses pop out and need to be put back in. The frames have not broken. True the lenses are a bit scratched now - from wear and tear, after two years, I'd expect that. And for under £10, I don't think that that is unreasonable. Given the abuse they have received and the unexpected admiration (I don't think they look that great myself, but to me they are just a necessary thing to have) I can't but rate this product very highly.