Of the 20 lamps I've had 3 fail. One was intermittently flickering due to a bad contact inside one of the 6 LEDs (not solder joint, this was inside an LED array). The other would not switch on about once in 10-20 times. The 3rd popped with a brief crackle after 4 days, I was sitting under it at the time. All replacements went smooth, no issues.
Consider that about 1/3 of our Philips Softone incandescent lamps failed within 2 months, one made a lot of smoke, I'm sticking with Viribright (but also keeping the receipts in case I need it).
The 11W has a lot less light output than the 8W, as stated here from the start. You have to look at the Lumen rating, not the Watt rating.
Bunnings Pakuranga now has a lot more Viribright stock and also added bayonet style.