I've got the g-string when it was in a sale for about £45. It's only the standard one. It's ok but i have a mammut Genesis, which is worth the extra.
I think you can get a pair of Genesis' for £120 at Outside. My climbing pal has a Millet Forces half rope which is used in conjunction with my Zero-g and the Millet has out-performed it in every way.
If you're looking at around £60-£65 each - there are better ropes out there.