BTW only get standard resistance for 510 - not anything marked Low Resistance or LR or HV (High Voltage)
I prefer Boge - Boge have a defined center channel and no inner seal. I get great life out of them and the center channel gives a nice draw. Over days of usage, if the channel gets crooked, just straighten it gently. You should be able to see light
through these cartos.
SLB is more like a fat slab of looser stuffing inside, with no defined air channel and an inner seal you need to remove whenever you add
juice (and I always forget and start dripping
juice on the seal). They are OK but I prefer the Boge and I prefer not having an inner seal.
Both Boge and SLB are manufacturers.