Tekkub, yes I'm fully aware that the probability have been explored to a greater detail, but I deliberately used the Armory data, as it is the only source of official information on that area.
The new version of enchantrix uses this table, as does one of my addons. GFW Disenchant Predictor also uses the same algorithm, it just gives fuzzy values (rare, frequently) instead of percents.
Planning on adding an exclusion list, so the info won't show for items that can't be disenchanted, just didn't have the time to add it, and wanted to release the addon with WoW 2.2.
For items that cannot be disenchanted, such as rewards from Halaa, can the tooltip addon just simply not appear? Any methods to detecting and determining for this?