nangnangnj, those are magnificent. i think you should get them. 170 is a reasonable price, especially since it's not going to be that cheap fake 'leather' fabric that rips. i mean, if you're going to wear them a lot mine as well get your money's worth. i say go for it!
Goldlion: Yes, they sure are. I hunted them down on topshop.com back when they came online, and I ended up paying overprice on ebay. But they are still cheaper than other genuine leather leggings.
I have those too, I bought them some time over a year ago, and haven't worn them since November 07. I have some lamé from H&M too, I have used those a bit. But not much at all, since I see hipsters in them all over, and I am not a hipster