The liners are of superb quality - very easy to separate (the perforations on supermarket caddies are, visually, very faint, so it's difficult to see where to tear them). These liners are also thicker than supermarket caddies, so less likely to leak.
About the only fault I can find with them is that, as with all food caddy liners I've tried, when you put a bag of food waste into the caddy, it pulls the liner into the caddy.
Better than the ones I buy at the supermarket and cheaper too. They tear off the roll without damaging the bags and they are just the right size for the kerbside caddy.