Both skills are useless, I left Judgement at 10 points for tempest, put remaining points the second job rush skills, brought booster up to 20 (1 point). Rolling spin is useless, and I have not been in a position where I don't have enough combos, they rack up really quick and don't disappear anymore.
To be completely honest, I'm sure a lot of the people posting in this thread came from pre-revamp, and rolling spin was actually a viable 3rd job attacking move, and what I used in 3rd job. I haven't touched Judgement to this day, but you need to get it to lvl 10 for tempest. @justsofly Well, I maxed toss because when I was training my aran, Toss was the best 4th job dps move, until 170, so I maxed it. At this point, I'd say its rather useless to max toss, so it probably is viable to max both judgement and spin because toss is very rarely going to be used.
There is no longer any reason to max Final Toss, so you should just leave that at whatever the junk sp number for 3rd job is now. Judgement and Spin both have their uses, however; Spin is useful for gaining combos on weaker mobs (so, for instance, if you're doing some stupid prequest way below your level, you can keep your combos at Tempest-spam levels for a longer period of time; definitely helped for the last fetch quests in Tynerium for me). Judgement gives decent DoT on top of its decent hit damage. No reason not to use it at times during boss fights. Similarly, if you get 1HKO'd at a boss such as Gollux and Recharge is on cooldown, you could use Rolling Spin to get enough combos to turn Drain back on.