KKD - You should go ahead and enter. The problem with a lot of 'serious runners' is that they try to put other people off because they want to keep the events limited only to people who they believe take it as seriously as they do.
I am a 'serious runner' having run 1 FLM (several rejections), another marathon, and many halves. What I love about London is the atmosphere and camaraderie. I would love to get a place and do it again and just enjoy the day for what it is.
So...notes to some of the 'serious runners' in this thread:
(1) Chris Brasher, who founded FLM, did so because he wanted to create the chance to see a massive amount of varied people all running together on the streets of London. I don't think he'd thank you for wanting to make it an elite event.
(2) I would strongly suggest you find yourself a different marathon to get a PB at rather than moaning that FLM is entered by idiots.
I bought 834s for this year's London marathon. I need cushioned shoes (normally run in Asics Nimbus) and couldn't afford anything too lightweight as my marathon time on my feet would be around 4hours.
They're great. Very light, incredibly cushioned for such a light shoe, and with the N-lock system which takes the laces round the heel, the fit is very firm. In fact, it's like running in slippers. And they look great!
I think the range of experiences and theories of why things went wrong from everyone on here just go to prove that no matter how much you prepare, there are dozens of variables that can change on the day and ensure you don't run your best.
Personally, I agree with Peter R and Cycloid that mental preparation can overcome a lot of things. This was my first FLM. I knew I'd trained hard enough and was aiming for a dream sub-4, but I didn't know at all what to expect from the day, but I was damn sure that for me and my sponsors (extra £200 riding on sub-4), I was going to do everything to achieve it.
When it came, yes it was warmer than expected, yes the roads were more crowded than expected, but I just put my shades on, started slowly, fuelled well, but mainly just dug right in with dogged determination that I could do it even from 19 on when I knew it was hell. I finished in 3h57.
I am not gloating. What I'm trying to convey is that I was lucky that everything seemed to fall into place for me on the day. For some it does, for some it doesn't. What I gained in an incredible time, I may have lost in not taking time to absorb the atmosphere on the day. But there are plenty more times to do that...