I wouldn't say it worries me, i just don't want to be changing coils when there is still life in the one it's happening with. I think the gurgle is the most annoying though. The 2 Luxe X Pro's are the only ones that i use stock coils regularly, I liked the Innokin Sceptre but not tried the 2, I did win a Sceptre 2 on here but gave it to my Son. i might give the Sceptre 2 a go but for me the Luxe X Pro will take some beating. I have looked at the Xros 3 and the Oxva Xlim over the past few days so will give them a bit more thought.