thanx for your comment on both strobes. Your experience displays exactly my concern. Both are great strobes, but with the YS-D1 there is a little risk to get a faulty one. And as the strobe is quite new, no one knows about That´s why i have choosen the Inon, where the reliability is far better. Additionally, there is a Inon set of bigger knobs to stick on the Z240 and make handling better.
I just ordered the Z240. My dealer recommended the strobe due to its well known reliability and excellent TTL-mode. The reports on the YS-D1 stopped me from giving this one a try, as we are heading for Curacao in November and I need a working strobe for the trip.