I was there yesterday, the chilli's were ok but didn't blow me away. My main point is in relation to the actual experience of the venue regardless of the band. I think in this respect Knebworth is a long way behind Milton Keynes Bowl which is far superior. I really struggled to see the band last night because of the angle of the hill and I know a lot of other people struggled with this. Saw Foo Fighters at MK Bowl last year and had a much better view/experience.
In relation to GnR playing a big gig, I think that it would be amazing and I am sure that they could sell 50,000-60,000 tickets, especially if they had some great support acts on to get the crowd going. Would love to see it but I think a new album would be my preferred choice.
The RHCP's were good but after seeing Axl and the boys twice last month, I can say that they didn't come close to matching GnRs intensity.