I trusted one of these hard selling by these sales people and regretted it. In 2017 went to buy Mitsubishi starmex GE series model but the guy kept pushing the FJ series which was one of the early 5 tick aircon saying latest model, energy savings blah blah. I thought fine, mitsubishi after all shouldn't be so bad. End up that thing broke down almost every 3-4 weeks for 6 months with various issues. Mitsubishi agent blamed the aircon company, company blame Mitsubishi with me stuck in the middle. After much back and forth and only after threatening them with legal action they took it back and replaced it with a Dakin non inverter as I requested. There was almost a 1k price difference between the 2 systems which I'm yet to get back, but I let it be since the aircon has been working fine.
Only after talking to some aircon techs later on, did I realise that the FJ series was a failed model with lots of teething issues. Probably why the seller wanted to get rid of their stock too.
Bottom line, do your own research and stick to your gut instinct. Don't let any salespeople sway your decision.