I personally cannot wait for these two rides to open at Gumbuya World, especially Project Zero. It is taller, faster and has a higher G Force level than every ride except for DC Rivals (even Project Zero beats Superman Escape) and the G Force level is the only coaster to reach 5.0 G, higher than DC Rivals with 4.3 G. Great addition to the park and I can see them (especially Project Zero) become the DC Rivals/Superman and Steel Taipan/Giant Drop/Tower of Terror of Gumbuya World.
I am planning to go in summer as it is easily the best Victorian theme park now. Gumbuya have certainly come a long way from Gumbuya Park, with only 10 years ago having no water slides, no rollercoasters, no lazy river and look at it now with 3 rollercoasters (compared to just one at Luna Park/Adventure Park and none at Funfields), 8 waterslides (two big ones, four racing ones and two regular ones) and a lazy river. Both the coasters will 100% be better than Scenic Railway and Crazy Coaster from Luna Park Melbourne and Adventure Park respectively.