I own 2 510 Kabuki's. Both have no issue with the connection.
They do not spit/gurgle...not even a tiny bit...also no leakage what so ever.
I mainly bought them as replacement for my Nautilus Mini because I like their look and size better, and because the airflow is better. As a bonus for me my GF still uses Nauti's so we can share the coils

The taste is a bit better than the Nauti, my guesstimate would be about 20%.
I recommend them, but they are a bit pricey.