I have had a pair of NF Hedgehogs for the last 2-3 years and have loved them - more comfortable than similar offerings from Merrel and others. The only reason I bought this pair was because the tread on the sole was wearing away - but given how much I have worn them, I think they have lasted very well.
These are slightly lighter than my previous pair and initially they feel stiff, but they soon loosen up and feel very supportive. I have proper walking boots for hard terrain, but inevitably I come back to these, when walking around the Sussex Downs and further afield.
The main feature is the use of GoreTex, which allows then to be breathable but waterproof - which is essential in this kind of shoe. Anything else in this kind of cross-trainer meets walking shoe, is just going to mean soggy feet and an unpleasant walk.
The other big selling point is the sole - which is very grippy and feels like it can deal with any kind of slippery surface well. I was most pleased to discover that Amazon had started stocking these and there have been some good bargains available around January.
I can't recommend them highly enough.