Please remember what Tony Gee says about Jupiter caps matters not at all for electronics for one reason. He only used them in speakers! My experience and comments are in electronics. Caps do not necessarily sound the same in both applications.
The Jupiters are just more musical in electronics. I hate brightness and glare. I long for smooth, natural tone. The CAST caps are tilted up in the upper mids and in the end fatigue me in electronics. This is not the case in speakers based on my experience. These caps do not always sound the same in both applications....very important point. In speakers, I choose the flat, pancake style CAST. They sound great and better than the cylindrical CAST caps for electronics based on my experience.
I find the Jupiter caps as dynamic as CAST in electronics....at least in my systems and applications.
Some of this comes down to personal preferences, but I do want to warn readers that Tony Gee's comments are based on speaker usage only!
An ASC oil cap may sound fine in a power supply, but lousy in a speaker. A Solen Fast Cap may sound good in a power supply, but not so good as a coupling cap or speaker crossover cap.