I'd be interested in a higher-end dual screen handheld if/when prices ever go back to normal. But the sacrifices they have to make to hit a budget price point just seems like it's not worth it over a modded DS/3DS. Original hardware is still the way to go to play those platforms since they're so easily moddable anyway, and for other platforms you would be better off buying any other handheld.
Even just the fact that it uses a capacitive touchscreen is enough to make it a worse experience for the DS games this is meant for. DS games were built around stylus use, and capacitive styluses kinda just... suck. I'm guessing resistive touchscreens just aren't readily available for manufacturing anymore, another sacrifice for cost, but it's another reason to prefer original hardware then.
I think the only real reason to consider one is if you just can't get original hardware, since supply is limited.