Yes they are but still they are also powered by Google so instead of any affiliates focus on Google instead.One advantage is that all the results shown on Sensis are from Australia but the point is how many people do search with the help of Sensis?

I'd never heard of them until now and I live in Australia - think you'd be better on concentrating on Google.

I checked the situation of this site. According to the different checking tools, it seems that this search engine has about 20,000 visitors daily and about 90% of them are from Australia. And according to Alexa information, this website is ranking #812 in Australia.
In my own opinion, 20,000 users daily is not too much but its also not bad because 90% of them are from Australia. So if you want to use it only for advertising in Australia, its not a bad choice but for other countries, its not a good choice.

i havent heard of it, but it seems pretty nice SE yet its powered by gogole so I just stick with Big G