I can vouch for the quality & brightness of these. I bought 8 of them from amazon.co.jp and put them in my 2013 BRZ and 2015 Impreza. The Impreza has a tab-to-3-blinks feature, but this is apparently controlled higher up than the flasher module as the two cars have the exact same flasher module. In fact, I modified the one from BRZ and put it into the Impreza.
Few points.
* The bulbs felt a bit loose, so I used a small screwdriver to stretch out the copper connection points inside the 7440 sockets before installing the bulbs so they hold the bulb better.
* I don't recommend the resistor mod (waste of power and breaks into the wires), nor do I recommend cheap flasher modules (had one, caused weird problems and wasn't behaving well to begin with). Just open up the stock flasher and replace the shunt resistor with a higher resistance, or grind away at it to increase the resistance. If you do it just right, it will continue to detect failed LED bulbs. You shouldn't go back to incandescent bulbs after the mod, though. You can always replace the shunt resistor or get a new stock flasher if you want to go back to incandescent, of course. Higher quality flasher is fine, also. My BRZ has a tab-turn flasher module (from Canada) with cool programmable features.
* Unlike FR-S, BRZ doesn't use dual-function 7443 bulbs for front signaling. They just use single-function 7440 bulbs, so you lose nothing with these bulbs on a BRZ.
Here's a pic of my flasher module hack:
