Started in pen 3 red start last year and yes it was a bit congested for the first half a mile or so but after that you can get into a good rhythm. I would agree with others that the congestion is worse around the 4-5 hour pens as have also started in pen 9 blue start before and took 19 minutes to cross the start line
I love the support and comfort of the Lunar Glide 4 Shields I got in January so much so I bought another pair in April and ran the London Marathon in them with no injury problems whatsoever.
My only gripe with the Lunar Glides is that I get blisters on the side/underneath of my big toes on any run over 5 miles (obviously not ideal for a marathon!). I have tried a variety of different socks - Nike Dri Fits, Asics, Hilly etc and have the same problem with all of them. My first pair were a size 7 so I bought a size 7.5 hoping the extra room would help with my feet breathing but no luck. Ive even done the soaking my feet in surgical spirit for 2 months to try and toughen my skin up.
After the marathon I decided to buy a pair of Asics Gel Excel 33's and so far so good on the blister front but I do not find them as comfortable (blisters excluded!) as the Lunar Glides.
Has anyone else had similar blister problems with them and if so is there a remedy for it?