It just so happens that I recently had the solder iron salesman out and he
had just seen the attached report. I have cut/copied his e-mail and
attached the data he sent with this email. Hope it helps.
"See attached charts supplied to Cooper by a
Japanise company evaluating soldering stations. Hakko had a slight initial
heat up advantage but the Weller WES50 had a major joint recovery
advantage."