In reply to dan lane: Several things:
- The number of UIAA test falls that the rope holds is probably the lowest of any on the market currently but still 60% higher than the minimum needed.
- It probably didn't pass the now withdrawn sharp edge test.
- The rope has no advanced coating to reduce wear.
The first and second won't make any practical difference to you whatsoever as the biggest risk on grit is extreme abrasion. The third might, but only if you are comparing it with coated ropes (Edelweiss/Perdur treatment, Edelrid/BS treatment) rather than another non-coated rope. Even then the jury is out on how much difference there is.
However, in terms of handling that is a very subjective thing as well as being probably more important that the exact number of UIAA test falls. Depending on your point of view it is likely you may find that the G-String handles better than as a Genesis as they tend slightly towards the stiffer side. Edelweiss and Edelrid generally have a good reputation for handling well.
Certainly my criteria for a rope are in order of priority:
- Good handling
- Features/spec
- Price
If your partners is worried you can buy Genesis for £73.39 each (Taunton Leisure) or Edelrid Kestrel BS for £82.00 each (Rock & Run
http://www.rockrun.com/products-Kestrel-BS-8.5mm-x-50m_CL-RO-KBS5.htm )
Finally I would actually question why you're buying double ropes for Gritstone but you could seriously consider buying a 60m or 70m rope and then cutting it in two. You can get a 60m Edelrid Kestrel for £100 from Rock and Run or 70m for £128 from Jo Royle
http://jo-royle.co.uk.