I have had the brakes bled for several days now with no problems. It's a very firm pedal with no leaks. I have really stood on the pedal trying to get the pressure up to see if I could get it to leak and I have let it sit for several days to see if it would leak or suck in air. After about a week, all looks good.
So...it appears that the flare seals do work, however, everyone needs to go with what they are comfortable with.