In reply to Martin1978: Well I went ahead and bought one so here's my take on it for anyone interested...
Very good quality, same as their Medusa 32 pack. Comfortable.
Downside seemes to be (I haven't run with it yet though) bottles hit elbows when I swing arms back and zippers aren't covered AND are on top which seems strange!
Plenty large enough for everything except a bike pump.
Will update once I've done some miles with it.