Far as CG wear on big wheel scoots go I can claim real good life on 2 SYMs and a Kymco.
I just replaced a rear on the mainSYM at around 12-13k. It still had tread left, but I'd taken a nail and there was some belt damage from that incident so it just wasn't quite the same after. The Front's fine but I may end up replacing it on age.
The Kymco S200 had about 6k on it, all but 500 on the CG, it was going strong, no issues on front or rear. I sold it after that so no clue.
I tortured those tires with thousands of hot freeway miles. They did great in the the Dragon too!!
The secondary SYM has about 5k on a set of CGs. They're 5 years old so they get inspected, but are fine (garage stored in the damp PNW).
Basically I'm a fan; albeit I'm curious about the Angels since they appear to have been created to compete head to head with the CG, complete with better siping.
I note the CG 2, not quite in this country yet, has similar siping to the Angel. I liked the old one, so I'm real curious about the new ones.