I've never used the jazz rounds although I use a set of the flats on my Ibanez (never understood what people mean by floppy; they feel as tight as a regular string to me)
I do use the DR coated strings and have done on quite a few basses now.
I've never used them on a precision but I use the red devils on my stealthed Geddy and they feel slightly higher tension than normal. They give me a really good punchy sound. One of the only strings I have used that has enabled me to get a really good sound for fingerstyle that I can quickly change, with no sound adjustments, to slap without sounding harsh.
I've also used them on my Thunderbird, Stingray, Rickenbacker and Bass Collection and I love them. I've only had the red devils and peacock blues.
I am using Pro Steels on my precision just now to try them out - I used them on an old rick copy I used to have and liked them so thought I'd give them a go on a good bass.
