I got the simple Link Analog one mainly to be able to quickly record some ideas on my iPhone. It doesn't need any drivers since it's transferring the audio data analog by simply using the headset jack of the iPhone or any other smartphone which makes it a super easy to handle device.
The issue that I've experience was a nasty clipping at the XLR input (even with gain close to zero) as soon as the signal exceeded "whisper" level. In other words, I had to dial down my guitar amp (miced with SM58 directly into the Link Analog) below my normal bedroom level to escape the clipping.
Meanwhile, I spoke to the guys at Thomann where I got it from and they think that I've simply gotten a defective interface, so I will return it asap. However, I've also figured out that it's easily possible to use my "old" Lexicon Omega Interface with iPhone/iPad by simply using a (no-name) OTG camera connection kit. First tests were successful with a decent sound quality, so that would clearly be my most favorite solution. Even if it's not as mobile as the Link Analog. So looks like I will also be leaving the Link Analog train again soon.