We have used radios for several trips & they have worked great!!! I would DEFINITELY recommend getting some with the privacy codes, otherwise you will get lots of interference with other parties. I would also recommend getting a good brand [you get what you pay for], like Motorola, Cobra, or Midland. Most of the radios now have 22 channels & privacy channels... from one of the radios - "Front panel push buttons provide easy access to all 22 channels (7 GMRS/FRS, 7 FRS, 8 GMRS). Privacy codes (38 CTCSS and 83 DCS) provide for a total of 2,662 "sub-channels" when combined with the other 22 channels."
I think the ones we have now have 15 channels & 38 subchannels & they've worked well for us.
Good luck.