According to my reading of Jarulf, the "damages targets armor" component of the ROE has the effect of "puncturing" which adds 4-12 to hit in Diablo. Assuming those stack, it seems to be marginally useful in Diablo even on hell difficulty. However, in Hellfire it would REALLY be useful since it reduces enemy ac by 87.5%(+ an additional 12.5% for the barbarian). Unfortunately, ROE is not findable in regular MP hellfire. (Lemming's Hellfire-Fixed mod) fixes that (among other things. My oldest SNOB warrior generally uses the RC and wears one ROE and the Constricting Ring. On levels where he dons the Gotter, he uses a second ROE.