While I love Cravens as an enthusiast, my abiding memory as someone who travelled in them frequently in their later years are that they were drafty, poorly-heated, and poorly-lit because more often than not the lighting would be on the blink.
While IÉ's railcar fleet doesn't really float my boat, the 29ks perform their intended role very well (moving large volumes of commuters reliably), and I enjoy travelling by 22k and find them comfortable - way ahead of many rail journeys I've experienced on the continent. Engine noise in the passenger compartment is something you'll experience on most DMUs, not just Irish railcars...