Gareth,
Like Guernsey replied, the best place to look for information is the Jabiru forum.
Bear in mind a lot of people have very different thoughts, try to get views from people that actually own a Jabiru.
After owning a aircraft for 10 months now, I realise I only need a two seater as friends and family stop coming out flying with me as the novelty has worn off and always seem too busy.
These days I really only fly around by myself, and perhaps should of bought a J170 due to the 600Kg max take off weight instead of 540Kg.
The Jabiru I have J160, is considered the sort of the middle size one of the range, each model size flies different so I can not comment on the J430.
It’s also a good idea to arrange to fly a J430 way before purchase to allow comparison between other brands of aircraft.
You have to consider the more seats and larger the aircraft the more it will cost to purchase and maintain.
On the forums there are people who swear by ROTAX engines, and look down on the Jabiru's engine (holden vs ford sort of thing).
The aircraft mechanic I use tells me the Jabiru composite airframe is nice and simple and keeps ongoing maintenance costs down.
JWW