New models are released time to time also by other manufacturers. Even they are competitors, it is still useful to get know about them and note either good and not so good solutions.
If you know your competitors models, listen what your customers like to have and try to go to it, you will be a best very soon.
I believe you because you are so far ahead from your competitors in support point of view. That's why I don't afreid to open this threat.
Here is latest news from garmin http://sites.garmin.com/forerunner610/
, they are released new 610 model with touch screen. I think that touch screen is not so big thing, but menu structure seems be quite nice.
Very poor thing is battery life, only 8h. This should be easy to beat.
There is not all details available yet, but when there are, I like to hear from others which one you like and which one not.