I have a z-pipe insert also. Only thing I don’t like about it is that it doesn’t always light. Gotta keep clicking it several times. Annoying.
I find the ignition system with the spark wheel on the zippo inserts to light more reliably. I agree though that the small button makes it difficult to use.
Gotta change my tune on the Z-Pipe insert. Once I figured out how to light it, much more reliable. You have to hold the button down just before it sparks for a moment. Then push it all the way down to spark it. This lends to it lighting far more reliably.
With this in mind, although I prefer a flint spark, the Z-Pipe is much better IMHO compared to the zippo butane pipe insert. If only the Zippo insert had a better fuel button.