In my opinion, it really depends on your personal time frame and purchase purpose. If it is for investment, I can say it still takes a while before Nusajaya's financial centre is realised. If you look at the long term plan, JB aims to move from agriculture and manufacturing base to service base by 2025. It might be able to achieve it, but I don't foresee that to happen in 5 years time. And within this 5 years, I might not be able to cover my monthly high installment as it might be a challenge to rent out such an expensive unit. So personally, I don't have that much holding power to buy it now.
If you look at the mature resale KLCC market, Imperia is priced almost the same. While the folks in KLCC next to Petronas Twin Towers can see return almost immediately, their time frame is perhaps just like me, short term.
Furthermore, JB is still very different from KL and SG in the sense that over in SG and KL, we can still survive without having a car, but it is not the same as for JB folks, and so...