It's much much better then the BOSE system in my other carI have the THX in a 2013 MKZ (and ordered it in my MKC).
If you want quality, clarity and brilliance in your music, THX is an excellent option. It is better than most music sources, so your music source will often drive the quality.
If you want tooth rattling sound sound. Loud. thumping bass. THX is not your best option.