A great deal depends on the weather on the day. Done it in road shoes 2 years ago and had no problems. Last year did it in rocklite 315's but wished I had done it in road shoes again. Its all down to personal preference and the weather.
Yeah i've got some 315's,find they have the same "clomping" feel as the 290,the 320 have alot more cushioning and so have a better heel to toe roll.Your right rock and stone is different in the wet.