As for ride quailty and comfort, for what its worth here's my opinion..........
Now woodford is height is 185cm (6 ft and 3/4 of an inch)
The 2nd class N set seating is terrible, no leg room at all except for only a couple of seats.
The noise of the VLocity does not bother my (I drive a diesel road vehicle), the ride is definitely better than an N set but the seats are designed for people well below my height so I find them somewhat uncomfortable.
The Sprinters are great,except when packed right up to the gills, it usually being fairly easy to get a seat with plenty of room. For what its worth I like the design of the machine also each separate car has a system with almost complete redundancy. There being very few failures which will actually completely halt the machine.