Personally - I feel that the Luvias is the best sub A$500 spin reel on the market ...... & in the smaller sizes the best sub A$600 reel
I've used the Luvias alongside a Certate ...... & it is certainly a lighter & smoother reel - I'd find it difficult to go past a Luvias if I had my time again.
By comparison the ci4 looks cheap & feels pretty average - you really have to go to a Shimano Stella or Daiwa Steez to better it .......... my opinion only
Chris