Still struggling through The Nine Tailors by Dorothy L Sayers. People keep telling me to stick with it as it's a classic, but it's like having teeth pulled...
I had the same experience. I enjoyed Murder Must Advertise very much, and friends urged me to read The Nine Tailors, but I found all those arcane details about campanology agonizingly boring. I gave up and never looked back.
I'm 90 pages in but as it's a hardback anthology (along with Gideon's Day, Fuzz and The Big Sleep - which is fantastic) if I haven't finished it by tomorrow I'll be giving up cos I'm going on a trip for a couple of days and will want something that fits in a pocket.
Since I picked up Devil May Care for 50p in a charity shop the other day, that'll most likely be next...