I entered the very 1st one. I sat out all night outside the PO with my entry ... didn't get in.
After that I decided I wasn't that interested - too congested to get a good time but entered occasionally over the years & didn't get in.
Now i'm slowing down I'm not too bothered about a good time and am more interested in the run. I got in via the ballot last year (wow) and enjoyed it no end (it was my 20th marathon) but I doubt i'll get in again and am not too bothered if I don't. It is good ... but not that good.