I haven't really travelled on them much to be honest. Though I wish I had. Have travelled on them from Liverpool Street-Harwich a few times back in the 90's, and then have made a number of short journeys on them from from Birmingham New Street-Birmingham International a number of times. And they've all delivered a superb ride.
I'll have to plan a journey very soon to travel on them before they get taken out of service.
Be sad to see them go.