The gusher was fun alright, I felt quite bad for the beer going everywhere when I opened it, but I think it was me who was effected most (my bag was directly underneath). Don't be too hard on JohnC when (if) he shows up to next months tasting, we don't want to scare a new brewer off. Just bought him a load of brewing equipment as a wedding present.
I've brewed bigger gushers than that myself, although when I did it, it was due to an infection and the beer tasted terrible. JohnC's beer was actually alright, I think it was just overcarbonated and filled too high.