I would love to do that one, but next year I have WDW/Tink in Jan and the NYC so $ and vacation days are all gone. Maybe in '14...
They're a lot better. I think I read a few years back that it's something like 16k for the 1/2 and 4k for the full. In the 5 years that I've been entering the lotto, the only time I got in (aside for the after entry like this year and last) was when I registered for the full. And if I did my math right, I think next year is their 10th anniversary so maybe more spots or something really special!
If you're looking at doing the full, the first 1/2 is the worst of the course. There are a couple of hills on the back 1/2, but they're small, especially compared to the 1st 1/2. The 2 downsides are that you come down a big hill at the Cliff House around 10 1/2-11 and see the finish but turn into the park and then when you leave the park around 15-16 you see it again and know you have to still go most of the 2nd 1/2. The other is that the 1st kinda wears you down a bit b/c of the hills, but if you make sure you take a lot more gu/jelly bellies or whatever on the 1st 1/2 to have enough to keep going.
The big plus though is that b/c it's TnT's biggest race, there are so many little groups of people along the course and the back 1/2 cheering you on. It's not like the Disney races, but it really helps at the end. If I did the full again, knowing the course, on a few of the longer runs, I'd go to an area where I could get in 18-20 w/ a lot of hills or run a reverse negative split ~ go really hard on the 1st half and slower on the 2nd just to get my body/legs used to it.
And the back 1/2 is pretty too~ you're along the ocean for a stretch/same at the end and you go around the lake which is pretty.