Pros: Nice, fun sound signature
Cons: Fit and durability
Highs: These have nice highs though they do not reach the highest up and lack just a little sparkle I felt that they are clear and enjoyable
Mids: Great mids, I love mid centricness which seems to be a niche group, however, these are not that mid centric (probably b/c of the bass). Vocals sound great, the singers take front stage and you can really feel the emotion on better quality tracks.
Lows: The lows are fairly powerful and are the main feature of these onkyos. Its very plentiful without being overpowering. They could be a little tighter but I'm not complaining, its great for the price range that it is in.
Soundstage/Resolution: These have a pretty wide soundstage for its type, very impressed. As for detail, they are not bad but I recommend some hifiman buds instead if that's what you are looking for.
Conclusion: The Onkyos are very good for a sub $100 iem. They are a lot of fun and I find them a good travel set as they have a shallow seal and fun signature that makes listening on public transportation very enjoyed.
I also found that these benefit greatly from amping. Even with my fiio e6 amp their resolution has sharpened and the bass has tightened up quite a bit. I have also seen many people on head fi report that they have noticed big differences with burn in.
I hope you guys get a chance to try these sometime in the future!