I own a 1.4SE GD Jazz and agree that the Jazz is so much more than an urban runabout. Most people I speak to say the Jazz is a small car, until that is I invite them to see the interior accommodation, rear legroom, boot space and 'magic seats' they are then normally pretty gob-smacked. I have done many thousands of motorway and main road miles, and am more than happy with the way the Jazz behaves itself, not to mention the excellent fuel consumption. Going on holidays we have managed to get two full sized golf bags with folding trollies and all our suitcases and bags in the boot without folding down any seats or having anything in the cabin area.
People should realise that road noise is 90% due to the tyre tread, and with Michelin energy savers fitted the road noise on my Jazz is not a problem, it is quite easy to hold a conversation with passengers at 70mph (I changed the Pirrelli tyres on my previous Civic to Michelin and experienced a similar massive reduction in road noise).
Apart from rear nearside wheel-bearing needing replacement at around 40K I have had no other problem with my Jazz in almost 80K of driving, with only routine stuff like tyres, disc pads, auxilliary drive-belt, spark plugs, brake and clutch fluid, gearbox oil (at 60K), cleaning out the EGR valve once, and one battery change (and of course regular twice yearly engine oil and filter changes).
Being an engineer, and having owned other Honda cars, I could see no valid reason to have the tappets adjusted at 25K intervals at £300+ a pop, and am now at a mileage when they should have been done 3 times, and emissions and fuel economy are spot on.
My wife has the same model Jazz and it has done a similar mileage, and all the above things apply to her car as well, so mine is not an isolated case.