There is no harm in Liana other than low market value. But as you'll get in low price already means this factor won't harm you.
Get a less driven, not abused Liana, It won't make any issue at all. JUst get the factory fitted CNG Version or Petrol only is better. Liana got flopped just because after market CNG version wasn't working with it. So road side mechanics and dealers started to blame Liana itself.
How can same engine is flop in one car (Liana) and successful in other (Swift). Both share the same M13a engine.
You'll get Liana in cheaper rate and parts are economical as well as compared to other Sedan.
Its not wise to buy same car again which you have already kept. One can get bored from it. Why buy and old hatchback when you can get a decent Sedan in it.
Better drive experience, better AC, better driving experience. Strong engine if maintained well.
Just sharing my personal experience not just a fan boy talk. Everyone got their own point of view. Hope it helps.
People will say it will lose money. My argument is Which car doesn't lose money? A car which you are already buying cheap how much it can lose?
Reference: I own a liana 2007 since last 2 years and 40KM driven since them NO ISSUE AT all.