You have made me feel a whole lot better about going the extra mile and opting for Nikons own.
And many thanks for the comprehensive reasoning as to why the Nikon unit is the better choice.
The original observation with regards to the top control screen on the camera, having the led light activated with flash connected to the hotshoe was my main reason for comment. I really do want to make Guys aware of the fact that this is not a Nissin third party compatability issue.
As said the same thing happens with nikons SB700, so this must be a normal operating function.
You do get what you pay for though, and having my time over again I would not have bothered with the Nissin. The extra functions,features, performance and build quality of the Nikon unit is very evident, and well worth digging that bit deeper into ones pocket.