Some people get lucky with Hoya soidaoensis and flower it early and at a small size.  I was not so fortunate in that it took 3 long years and much trial and error.  It was however worth the effort.  The plant is not for beginners, but with its beautiful flowers, I believe it to be a worthy addition to the collection, and as far as flowers go, it is superior to both Hoya caudata, and Hoya flagellata as you can enjoy the flowers throughout the day.