I used to hate the H1-4s with a passion when I was little, mainly because of their lack of A/C and their age.
Now I absolutely love them: the bench seats, the dim lights, the huge ventilator fans, their distinctive noises, the way the doors bang on each other when the train is going through the tunnels, the not-so-smooth acceleration...
Every Fri when I come out I'll usually try to catch one at Islington stn just for the enjoyment of riding a H4.