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i had a play with one last week and was impressed... a friend of mine is trialling one. There are a few niggly things that he didn't like, but overall he liked it. I have to say that Suunto have got the design just right... If Apple did sports watches they would be called Suunto!
I have had my Ambit since they were first released in March, and have been using Suunto for many years. The Ambit has been aimed at "Explorers" but also fits well with Ultra / Trail running community due to its battery life. There are forums dedicated to Suunto where you can find plenty of info: http://forums.watchuseek.com/f233/
I would also take a look at Movescount application, as this is the only app you can use for uploading you data to.
My personal opinion, check out the pros & cons against your requirements as £400 is a lot of money & the Ambit does have its faults & functionality is limited in areas.
For a runner, unless you are really heading off the beaten track, the Suunto T4c/d is much better value.