The FT4X was my first radio I purchased after getting my Ham license 3½ years ago. It's a competent radio.
That said, it's not FCC type-accepted for Part 95 use. Yes, I know the 'code' to unlock my FT4X but it would be technically illegal for me to operate it on anything other than the bands/services approved for Part 97 type-acceptance. I'm licensed for both services (amateur/GMRS).
No laws/regulations exist against listening in on the GMRS service.
WRUK662
WA7HPK