I got a pack of the smok q2 0.4 ohm coils. They Vape about the same as the wotofo 0.25 ohm coils, comparable flavor and vapor in the low-mid 30s watts. On my DNA mod the smok coils measure 0.43 ohms, while the Wotofo measure 0.34 ohms.
I prefer my own twisted kanthal coils, at least as good a flavor and vapor down in the mid 20s, but both pre-built heads are respectable.
The smok coil does have a bit of an off taste at first, but that goes away quickly. The smok coil has a more restrictive air flow, so I opened up the Wotofo tank afc a little to compensate.
Along with the coils I picked up a 30ml yftk squonk refill bottle, just over $4. It looks like it'll work fine, at a fraction of the price of most of the 510 connector bottles. It doesn't have an insulator on the 510 top, so you should either remove the battery or not press the fire button while refilling (if it's a mech squonker); that's in the noise for me.