I've used Stardusts from gotvapes for about seven months, first the regulars and now the rebuildables. I have novas and kangers, but I use the Stardusts almost exclusively. I love them. If I get a burnt taste on a draw, I tip my PV so the liquid runs toward the drip tip and the next draw is great. Also, loosening the drip tip a bit can sometimes make a big difference. I've never had one that was unusable out of the hundred or so I've used. I like the draw on them, the flavor is the best for me out of all the options I've tried, and the only time I've had leakage is when I haven't screwed the drip tip in all the way, which is user error. You might want to try playing around with the drip tip, loosening it a bit and vaping to see if that makes a difference.
I always let a new one sit for a couple of minutes when I first fill it so it has time to wick up the liquid, then I take a few primer puffs on the lowest voltage. After that, it's golden for me. With other cartos and clearos, once I get the burnt taste I can never get a good tasting vape off it again. With the Stardust, that's not true. I can get a burnt tasting draw, tip the LED end up then back down and have great vapes again as if the burnt taste never happened.