Uwell Caliburn G4 Pro

The G4 Pro uses Uwell's GPP pods, refillable 3ml cartridges you fill yourself with the juice of your choice. The kit ships with two: a 0.4ohm pod for a warmer, looser restricted-lung draw and more vapour, and a 0.9ohm pod for a tighter, cooler mouth-to-lung draw that sips less juice. Swap between them depending on the day and the strength of your nic salt.

Flavour is where the Caliburn earns its reputation, and the G4 Pro runs Pro-FOCS 4.0, the latest version of Uwell's flavour-focused coil tech. It is the reason people stay loyal to this line: clean, accurate taste that holds up over the life of the pod. When the flavour does eventually dull, you do not bin the device, you just drop in a fresh pod. Stock up with the matching Caliburn G4 Pro pods.

You fill the pod with bottled e-liquid, and for a kit like this you want a 50/50 nic salt. Salts give a smooth hit even at higher strength, which is exactly what you want off disposables, and the 50/50 mix wicks properly through these MTL coils. Anything from our nic salt range works: Hayati Pro, IVG Intense, MaryLiq, ELFLIQ, Doozy Infinity, OX Passion or Riot X. Want a bigger bottle of nicotine-free juice you nic-shot yourself? A 50/50 freebase like IVG 50/50 suits the higher-resistance pod too.

Filling takes a few seconds. Lift the pod out, open the fill port on the side, drip your juice in to the 3ml line and close it. Give a new pod a few minutes for the coil to soak before the first vape, which avoids a dry, burnt first puff. After that, top up whenever it runs low.

All five of the popular refillable pods do the same core job, so it comes down to what you value. The G4 Pro is the premium, tech-led pick: the touchscreen, the biggest 1800mAh battery, the most power at 35W, three modes and the Caliburn flavour name. The trade is that it is the priciest and the most feature-heavy, which some people love and some find more than they need.

If you want the same idea with a smaller screen and a lower price, the XROS 5 is the obvious rival. The Xlim Pro 2 is the coil-swapping all-rounder, the Argus G3 the chunkier big-battery option, and the Gotek X the cheap, simple, no-screen starter. There is no wrong answer here; the G4 Pro is for the person who wants the best-equipped one.

Buy the kit once and you are then only ever paying for pods and juice, which works out far cheaper than a disposable habit. See how the maths compares against prefilled pod kits and full-size sub-ohm vapes.

The touchscreen sounds like a gimmick until you use it, and then it is hard to go back. Setting wattage is a swipe, switching from Waves to Storm is a tap, and the puff counter and battery sit on screen at a glance, so there is none of the click-click-click button counting that other pods make you learn. You can lock the screen so it will not change in a pocket, and dim or turn it off to save battery, which is worth doing since a bright colour screen is the one thing that draws more power than a plain pod.

Beyond the screen it behaves like any good refillable: fill the pod, prime it, vape, and top it up before it runs dry. The 1800mAh battery means charging is an occasional chore rather than a daily one, and a quick USB-C top-up gets you going again fast. Keep a spare pod in the drawer and you will rarely be caught out. For a first proper kit it is a lot of device, but nothing about it is hard to live with once it is filled.