No it is not a good Buy As its 1.2 GHz dual core Processor 1 GB Ram and the ZenUi Does not perform better hangs in day to day tasking.
Recently I have Bought Lava Iris x1 and I am Very Happy with all its android Kitkat 1.2 GHz Quad Core with 1Gb Ram and Video-core IV GPU an 8 Mp with Auto Focus, BSI Sensor, 1.4 m Pixel Size, 5-element F2.2 Lens,dual Led Flash and 2Mp Secondary camera offers a Great selfie in sunlight but not that great in artificial light.Go for 8 Gb Rom One As it offers 2100mAh battery Over that 1800mAh in 4GB Rom device.
I WOULD SUGGEST YOU TO GO FOR LAVA Iris X1 Over This Zenfone A450cg.