This stuff (Z2 Pro) blows the old stuff away. It is now fool proof and dries super fast even when not using ZFX. I already had Zaino on my 76 vette so I did not use the ZFX on that car and had no problems with drying at all. I was experimenting with some other products on my MB C320 so all I did was wash with Z7 and followed up with the new Z2 Pro and ZFX (since you need ZFX the first time and every 6 months to a year there after) and the results were perfect. You can even just do one panel and wipe it off immediately with no problems. When I say this stuff dries fast you have no idea, even in inclement/humid weather I have had no problems. I have experienced no problems with streaking and even think the shine is better (if that is possible).
If you haven't tried Zaino in a while I recommend you try it again.