I have had no indication of a burnt taste. I ordered a package of both sizes and both worked fine. I put in another order today for some more since I know these can be hard to find. To me, they are identical to the royal smokers version, but they are clear so you can see how much juice is left in them. This makes it easy to tell whether you need to add more and prevents overfilling. I've also had no leaking from them at all, which is not something I can say about other cartos I've used.
As far as customer service is concerned, I did not have any problems. I received my first order within 2 days, and this was during the Christmas madness. They use Fedex instead of the usps.
As far as customer service is concerned, I did not have any problems. I received my first order within 2 days, and this was during the Christmas madness. They use Fedex instead of the usps.