The filler isn't as absorbent on the first fill (it's A-OK after that though). I don't know why but they are a little easier to burn than the boge. The flavor is pretty good, but I prefer the flavor from the boge. And, I think quality control is better with the boge.
They produce great vapor, good (but not as good as boge) flavor, and they hold up really well with VG juices (usually - I have two juices that can plug up any filler carto in less than 2 days and often in less than 1). I think the smoke tech actually performs better than the boge with VG juices.