LIEVEN over on Headfonia posted a review of the quad-BA plus dynamic driver IEM. From the review it sounds like LIEVEN really liked this flagship IEM. Likely due to the dynamic driver, the A91 has bolder mids and bass than some comparable BA only IEMs. Pop over to Headfonia and read his complete review.
Glassmonkey posted a detailed review of the Fidue A65 – Titanium dynamic driver IEM on Head-FI ($50 to $75).
Pros: neutral signature, good performance, good detail, great price, gorgeous, changing signature based on amping
Cons: may be source dependent for sound signature, sometimes veiled on treble/upper mids, average sound stage
Fidue A65 Review