I have not used ester line very much, mostly because the way I normally fish doesn't call for it. Ester line is dense enough that it will sink. It has no stretch. Thus, it is very good for fishing light jigs in deeper water. Crappie and bream fishermen love it for those characteristics, but it is a love-hate relationship. Ester line really wants to jump off the spool (so don't even think of putting it on a baitcaster - trust me).
With a spinning rod, that is a problem with a very easy solution. As soon as your jig hits the water flip the bail or put your hand or finger on the spool. AS SOON AS! That will prevent the biggest problem people have with ester line. A second issue that some have raised is related to the lack of stretch. Some people report unexpected line breakage. I think this is mostly with stiffer ajing rods, and almost certainly can be cured by dailing back on the strength of the hook set. When I used ester line in Maine, catching 2 lb+ smallies, I never once had the line break.
If you want a sensitive line that sinks, you want ester. Just remember to flip the bail or grab the spool, and don't try to cross their eyes with the hook set.
Header photo: Tenryu Rayz RZ4102B-UL, Shimano Calcutta Conquest BFSHG ('17)
The hooks are sharp.
The coffee's hot.
The fish are slippery when wet.