I have a 310xt with heart rate monitor and foot pod and although I really really like it, it is designed for trialthons rather than specifically running as such it misses out on some of the desirable features of GPS devices made specifically for running such as pacing alarms.
It is also not the wisest buy in terms of value for money imho
Its a great product but overkill for most people imho unless you use the cycle kit and swim with it you miss out on many of its features. You can get devices with similar runing fuctions for far less money imho
I personally advise the 405 for running, its a great bit of kit.
Having said that if you have money to burn and do not want a pacing alarm the 310xt is great imho
Edited: 25/02/2010 at 15:00