Look, headroom is definitely a concern but it’s completely manageable. You’re obviously going to be compromising at some level given the price, size, and the fact it’s primarily intended for lav mics.
That being said, I think the quality is perfectly acceptable and I think it’s a no brainer purchase for people who like to record synths to mobile devices. It’s light enough that it just feels like an extension of your headphones. If you’re not bothered by something more bulky then there’s definitely better options, but if you want tiny, this is it.
Audio example over in this thread: Rode AI-Micro and/or other tiny audio interfaces - #18 by Stone262