I have only really used poles for uphill, never even thought about running with them, I will have to give it a go. Does it really make that much of a difference ??
hhmm, well not to speed no, I find that they will cut down on wear and tear and therefore keep your legs feeling fresher, longer. On flater, technical ground your joints. tendons, etc. have to work to keep you upright and moving forward, using poles reduces these stresses hence why I believe they will help on longer events.
That said I would be hard pressed to think of a flatter event where I would consider poles, probably getting in to 100 mile plus region then I may be swayed.
We have been slow in the UK to catch on but they are widely used elsewhere, looking forward to hearing how you get on.
Frenchy.