Iemsonly posted a review of the R-115 IEMs on Head-Fi. It is a single BA driver IEM and such has compromises as you can see from iemsonly’s summary:
Pros – Perfect bass, lush and intimate mids, super easy to drive.
Cons – Laidback treble, slightly coloured, not very detailed
At the $120 USD price point you have many options including the fantastic en700 Pro from Simgot.