Thanks for the advice Lou.
The guy in the running shop thought the Cascadia would be ok for high road mileage too. Why do you think otherwise?
Thought I'd back up my advice with some hard evidence so went for a run in the Cascadia's yesterday. Did about 5miles off road (mixture of had gravel former railway line, canal towpath, muddy footpaths and a couple of freshly ploughed fields) then about 5miles back on the road.
The Cascadia's are definitely less cushioned than my road shoes and I think slightly heavier, but that might be all the mud that I picked up over the first section of the run.
The main difference though, and I think the real reason that I tend to prefer my road shoes, is the fit. I have high arches/instep and my asics fit very well. The Cascadia's have a relatively flat insole, so don't give the snug feeling. This is entirely sujective I know so might not be relavent to you.
Edited: 21/10/2012 at 08:36