Nice answers Adam. I go away for 10 mins and a good thread breaks out. 
Yeah, like Adam said, the electronic flashers are more stable with varying loads (like the alternator discharge Adam mentioned). I would use them on cars with altered lighting (even using LED's will lower the amperage/wattage draw enough to cause the bi-metallic-contact in the mechanical TS flasher to flash slow. Or like Adam said, when adding trailer lights to a system (not designed, per se, for them), it helps with that.
I try to check my lighting every now and again anyhow (at night, buildings with reflective glass windows work nice). And for TS lights, I just hit the hazzards and do a walk-around.
I can see Jess' point about not knowing a bulb is burned out.
Yeah, like Adam said, the electronic flashers are more stable with varying loads (like the alternator discharge Adam mentioned). I would use them on cars with altered lighting (even using LED's will lower the amperage/wattage draw enough to cause the bi-metallic-contact in the mechanical TS flasher to flash slow. Or like Adam said, when adding trailer lights to a system (not designed, per se, for them), it helps with that.
I try to check my lighting every now and again anyhow (at night, buildings with reflective glass windows work nice). And for TS lights, I just hit the hazzards and do a walk-around.
I can see Jess' point about not knowing a bulb is burned out. 
