Awww... thanks Jo! It was a great race! Tough, but now I'm not sweating the Disney ones. At. All.
I have the 10 and the 110.
The 10--- what I didnt like was the instant speed it showed me. What I mean is it shows me how fast I was walking or running at that time. What I wanted was something showing me over all pace for the mile I was on.
I felt I was always looking at the 10 and trying to figure out the lap pace. It does show you that, but not until you hit your mile. I wanted to know when I was at .85 that I had to turn it on to get my pace where I wanted for the average to give an example.
The other issue with the 10 is that it only has a 5 hr battery life. *if*- and thats a HUGE if- I ever do a full, I'll need a lot longer.

So I bought the 110 on Ebay. For about the same price.
110 had the HR monitor too. I like this for pacing help- if I am pushing into the 180s on my HR I know to back off a little. Some people can feel that naturally, but I needed to see the numbers. IT helped even my pace out.
110 shows me the average lap pace, so when I'm doing my intervals, I still get the overall pace for the entire mile so far- not just what I am doing when I am walking. Does that make sense? So if I hit that .85 and I'm a little slow, I know to turn it on to get to the 1 mile mark at the pace I want.
110 also has an 8 hr battery life. just in case.
It is super simple like the 10- just has a few more things I liked. Calories, pace, mileage, overall time, and HR are tracked
HTH!