Sorry to hear, back issues are a bitch, but to be fair, if it would not have been the jack, it probably would have something else you would have lifted instead.
What I am most interested in when it comes to the jacks, does anyone know about the quality of STA parts at all? I know that mainly the American car guys shop there but was wondering if the quality is good, I am planning to have a drive there tomorrow to have a look at their jacks.