I've tried different kinds of juices. Honestly, I'm not so experienced with PG/VG and all this. Have tried juice from different brands/shops, with pretty much the same result. It's not the juice/vapor itself that is foul tasting. It's the small drops of juice/condensation within the outer part of the tank that mixes with the vapor and creates the taste.
The outer part of the tank looks like your bathroom mirror after a shower, with small, and some big, drops of nicotine/e-juice in it, which mixes with the vapor and creates nicotine taste in your mouth. Anyone who is familiar with Scandinavian snus knows exactly what I mean.
peraspera: Do you have any pictures on how the ppc should look if it's the good version? I bought my eroll from a shop in CZ, and suspect it's from an old batch.