The Caliburn G3 comes with two coil options:

We tested both coils extensively and were impressed with the coil life. The 1.0Ω coil lasted us about 12 days of regular use before the flavor started to decline — that's above average for a pod system. The 0.8Ω lasted about 8-9 days, which is also solid.

One thing we really appreciate: Uwell coils are widely available and reasonably priced. You won't struggle to find replacement pods, and they're not exorbitantly expensive like some proprietary pod systems.