I also got mine at the dealer.
As you say, better from a safety point of view but the stoopid thing is that they are ileagal over here ...
I've had cars flash me because of how bright they are. I think, screw 'em! They have flashed because they've seen me - job done!!!
I use mine when the light starts going or in busy traffic.
Nobby has his on all the time - I know, I've ridden for quite a few hours in front of him
I've had mine re-wired so it comes on with the main beam - rather than the aerobics exercise of switching it on when needed using the toggle switch on the back.
Mine was looked at by the dealer at one service because it blew bulbs after only using it twice!
Check the wiring in the light shells and use electrical tape on ANY exposed connections/wires.
Sounds obvious but there seems to be a few that have blown bulbs and/or fuses because of wiring.