I recently picked up a couple of 6mm ruby spheres from Cryptic Culture and have been taking them for a spin in my Ligers.
They definitely vaporize your concentrates more quickly and efficiently.
Using a 30mm sapphire insert I'm down in temp from 590* w/o spheres to 570* with two spheres.
Could probably go lower will give it shot and report back.
The spheres add more thermal mass, surface area, and agitate the oil when the orbit the insert.
Using the 30mm Liger + two spheres + Coojo cap I can induce light spinning in the spheres.
You have "chase" them around the insert with the airflow.
I have one tight Coojo cap and one open; I use the tight one for the initial hit, open one for clean up.
The open one induces more spinning than the more restricted cap.
The CCA Hurricane cap does induce spin as it's air intake is offset and angled.
I like that cap, but not as much as the Coojo caps.
Using the 20mm Liger with sapphire insert + one ruby sphere provided what may be the best tasting dab I've ever had: Electric Lemon / Cuvee Live Resin with a drop of Electric Lemon HTSFE.
Mmmmm, lip smacking!
However, I've been using the 30mm with AH coil pretty much exclusively and have it dialed to my liking.
Even thought the aforementioned dab was heavenly tasting I still find the 30mm to provide more punch.
I will be using the 20mm + sphere now on occasion, when prior to the sphere it typically sat idle.
With the 20mm I used a Gordo Riptide Bubble cap which induces very fast spinning.
One neat thing was you could see the vapor intensify when you heard the sphere start to spin up.
Anyway for $20-$25 a sphere (Eternal Quartz also has them now: quartz, ruby & sapphire) I recommend.