@OP, please don't listen to the hearsay. Visit Liana owner's club and talk to the owners.
I bought mine new in Jan 2008 and have driven it almost 100,000 KMs and it has (Alhamdolillah and Mashallah) been a wonderful experience. People who say the interior quality is not good probably haven't driven JDM cars. Just try and tap the dashboards of new CIVIC, Corolla and City and you will see.
Comfortable, reliable, fast and economical. I get around 140 Kms on a single tank of CNG in city. On GT road, I managed 200 KMs on a tank with 240 bars CNG pressure.
Feel free to contact me for details.