I hate to leave a bad review on CandleScience (CS) because their customer service is so supportive. But this is for the benefit of other makers.
We'd been using ECO 14s from another supplier with good success for about a year when we decided to switch to CS's ECO 14. We liked how theirs were more rigid, making the candle easier to wick. Because these were the same brand and ostensibly the same wick, we didn't conduct any thorough testing when we made the switch.
Within weeks of sending out a big wholesale order, our customer contacted us to say that the candles were extinguishing themselves after 2-3 hours. We crazily began test burning each of the 12 fragrances we offer. Sure enough, in 10 out of 12 scents, the wick was clogging and drowning within 4 hours. Could something about CS's proprietary coating be causing this? We can only guess. Whatever it is, it's costing us a lot of money. For reference, we use 8-9% fragrance load (our own blend--we're perfumers) in GB 464 with no dye.