Please see the Sundara thread for more info – I don’t own one. Take the comments about reliability seriously, as well as comments about effective amplifiers.
Beyerdynamic is polarizing, as the brand tends to have bright/sharp treble. This tone is preferred by some people, along with the similarly bright Grado. Others find these brands to be piercing and painful. You must try for yourself, but they are not nearly as popular in this forum as less bright or warm brands (e.g., Sennheiser, Focal, ZMF, Koss, etc).
If it’s not adding value and you are not happy, it’s easy enough to return.