They look quite good. At £9 for 2 I think I'll give them a try. Look better value than the Figleaves own brand ones I've got...

They are okay. The back and sides are good but the pouch could actually do with being a little bigger; even when not erect you often poke out the top a little and the sides gape, but this isn't a dealbreaker. They're worth £4.50 each. Postage is a fair bit but they arrive quickly. Be prepared for a lot of mailed adverts though - but I emailed them asking to be taken off the mailing list and they did so with no complaints.
Honestly I tend to buy women's thongs from LaRedoute, as many of their styles are fitted well and are almost as if they were designed for men. The cotton ones obviously tend to do this to a greater extent but my favourites from their website are the lace hipster thongs; these fit brilliantly and it's a good thing as this style specifically for me are hard to find. Also a favourite are the lace tangas: these don't fit as well around the crotch etc but the design is great (albeit quite feminine, so if you and yours aren't into that, I wouldn't go for them) and I get round this by wearing something else underneath. My standard variation is a HOM plume under these tanga panties, which still allows the feel of the lace whilst providing support via the Plume.

 Which cotton thong do you recommend? I prefer microfibre has more give..

http://www.laredoute.co.uk/pack-of-2-invisible-cotton-thongs.htm?ProductId=324168651&t=1

These are okay, man. Not particularly brief or anything but comfortable. I normally wear them when I'm just pottering about the house and the like. As mentioned I prefer the lace ones from La Redoute in any case.