Tecma toilets are fine toilets,...and yes, they will eat just about everything except wet wipes. But they're a bit power and water hungry (.7 gal is about 20% more than average)....and pricy!! There are quieter less expensive choices that you might want to check out before making a decision: The Raritan SeaEra was top rated by Practical Sailor ("best budget buy") a few years ago
Raritan SeaEra Promo Sheet is available in both sea water and fresh water versions, as either a complete toilet or a "conversion" (you can keep your existing bowl. seat and lid, which can save you quite a bit of money).
Raritan SeaEra Conversion Promo Sheet I'm adding the owners manual so you can see what's involved to install it
Raritan SeaEra owners manual
Or you can go top of the line with the Raritan Marine Elegance
Raritan Marine_Elegance Promo.pdf [URL='http://raritaneng.com/wp-content/uploads/2016/03/L490V0815-Marine-EleganceOM.pdf']Raritan Marine Elegance Owners Manual[/URL].
Raritan toilets are made in the US, which makes 'em pricy in OZ, but are made to provide decades of reliable trouble-free service. Raritan has an excellent distributor in OZ --AMI Sales, who has locations in all the major population centers. Troy Cameron in their New South Wales location would be your go-to person...he has ALL the answers. I can give you his direct contact info if you want it.
Jabsco now has only 3 mfr'g locations: UK, Mexico (everything sold in the US) and China. Not sure where Jabsco products sold in OZ are made...those made in the UK seem to be higher quality and more durable than the others.
TMC is a Taiwanese company that has pretty wide distribution in Asia and OZ. Their toilets are very inexpensive, with durability to match price....2-3 trouble- free years is about average. Their owners manuals don't provide much help either.
That should be enough to get you started checking out what's available to you...I'm sure it'll result in a lot more questions, so you're welcome to give me a shout if you want some help with the answers.