This is a climbing vine with tendrils that grows very fast and provide fruit from about 18 months (although mine is flowering at 12 months), I have read that they should be replaced every three to five years as they lose vitality.
I have both Panama Red and Panama Gold, as well as another grafted variety from Bunnings. The first two vines (Panama) were planted out of season and are probably about a year old now. It seemed to take forever for them to grow, but they are really bushy now and grow new vines every day... there were some trying to get into the bedroom window a fortnight ago which were tied down - and now this morning there were another three!
I didn't prune them back this spring as I wasn't aware that you should - fruit are born on new growth.
I had a fair few flowers from about a month ago, however no fruit developed. A quick check on google advised that it was likely poor pollination so I have been hand pollinating for about a week, still no fruit visible at this stage but maybe a bit early to tell if it has made a difference.
The flowers are really beautiful - not what I was expecting at all! The pollen is found under the five stamens you can see in the picture. The carpel section is (I think) the three ovaries that come from what I imagine will be the developing fruit...
To hand pollinate I have been using my finger to collect the pollen off the stamen, then touching the underside of each ovary and if there is more than one flower I have been trying to transfer pollen from other flowers as well so each flower gets at least two hand pollination attempts.
There is a good factsheet provided by the Qld Government which I have found very interesting and helpful. http://www2.dpi.qld.gov.au/horticulture/5524.html