I've recently installed a new panel in my aeroplane and we (me and my co-owner) were deliberating over whether to iclude SV in our spec.
My contention was "what on earth for, you can look out of the window" and then someone pointed me to this:
Aircraft Engine Failure IMC with Synthetic Vision - YouTube
and the decision was made for me.
I've just started test flying the aeroplane with its' new panel and after only three hours I lost sight of the runway on finals due to the low sun; a quick glance at the screen and there was the runway laid before me.
If you're in a position to install it I highly recommend that you do!
