I think this must be my 5 or 6th pair from the Brooks Cascadia series. I've had  them a few weeks and they feel ok, but then my old Cascadia 5's were pretty worn out. Also no one has commented to me, "Where did you get those shoes?" so they are not as ugly as some of the past Cascadia shoes (the yellow & red ones).  I live 3 miles from the nearest paved road so I wear these all day, not specifically for trail running.  Fit seems to be the same as the 3s, 4s, & 5s so I am pleased as I buy them from Amazon without trying them on.
The Biggest and best improvement is the flat style laces. Might seem minor but those old slippy round laces never ever stayed tied unless you double knotted them.  I would often forget and every time I was on the roof or ladder, carrying items, racing for a plane, in a race, biking, etc they would come untied.  They never wore out or broke but I would retie them all day.  I can live with the neon blue color laces(they will soon be dirty) and give a overall 5 star rating due to the improved laces.
 However the old laces are great for wick watering of inside plants when you're away for extended periods of time. Place the one end a few inches into the soil and the other end in a 1 gallon milk jug of water.  Good for three weeks or more of watering. I'd remove them from the old shoes first..  ha, ha,  [...]