I have 3 smoktech DC tanks. All of them are slidy, but it's not that bad, and fortunately don't leak at all. I actually prefer them over my liquinator. That one is a major pain to fill/change cartos, because the inner seals are TOO tight. The DCT carto just slips down, fill the tank, and slip it back up through the top seal. I literally have to fight my liquinator to get the carto back through - I've tried slipping the carto out from both ends and it's still a pain either way.
I just wish boge would make flanged preslotted cartos at the correct length for the DCT. That would be heaven.