My friend got some of the Jaycar FA-003's. I like each individual characteristic of the sound. Like the treble extends far and is nicely detailed, the bass is punchy without being overwhelming, the mids aren't recessed and sit nicely in the middle, the soundstage impresses me for closed headphones. They're also quite detailed overall, although not as detailed as my Sextetts. I just find the overall tone a bit too dark so I can't really enjoy them. They sound heavy compared to my light and sweet Sextetts.
Hey, I bought the replacement angled leather pads for NVX XPT100 and put them on my Jaycar FA-003's. I don't have any way to test FR, but I find that it opened up the high end somewhat, making everything sound a little brighter compared to the stock pleather pads. They are super comfortable. Just my observations. Good Luck!