I don't particularily mind these locos, especially if I'm at a railway for a ride. If I were to go to take photos, I may not be so happy.
I suppose they lack some of the nostalgia of an ex-BR loco, especially on a passenger train. They do however produce the nostalgia of early preservation, which is something that interests me as someone who wasn't around during BR steam.
The only industrials I own are those from the Hornby club, but I must say I was very tempted by Hornby's Wimblebury a few years ago, but was put off by the blue running plate.