At present it only works on one side but I have plans to use a 'Y' piece pipe splitter to eventually feed both sides.
With regards to dumping the contents onto the back wheel, I'm not saying it couldn't happen but previous evidence shows it is highly unlikely. I fitted the same system to my previous FZS600 (I foolishly sold it but that's another story) and I never had a problem with it.
I turn the tap on and give a couple of pumps on the primer bulb and wait for 20 seconds of riding and then turn the tap off.
As you rightly say there is evidence of my experimenting but to be honest I was so pleased with my handiwork that I pumped the primer bulb four or five times which is excessive hence the puddle.
I don't leave the tap on constantly as there is really no need.
The last one I made was on my old Fazer for around five years and around twenty thousand miles.
As for worrying about the tap failing it would be interesting to know the MTBF for motorcycle fuel taps. I've done around twenty five miles so far and only needed to use it once and there is no leakage with the tap closed.
As for the Loobman they are good value for the money but a bit flimsy. I had one fitted to a diversion but the reservoir had a plunger type valve that failed after only 15 months.
Thanks for the concern and interest. I will keep you updated with an honest appraisal of how it operates, faults and all.