We can't say if you need to upgrade or not. If the FMs are working well for you now, then I'd keep them unless you want to upgrade. The advantages for good 2.4 gig radios are:
- No frequency conflicts with other R/C radios operating nearby. Not just from other boats, but cars runing a block away that you cannot see.
- No crystals to mess with.
- Fewer problems with interference, either from stray radio frequencies (pagers, etc.) or from the motor/ESC/Packs in your boat.
- Shorter antennas, some of which do not neet to be outside the hull. This is great for scale boats where antennas spoil the look.
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The regonal races in the Texas area usually impound only AM and FM radios. I have not been to a race which impounds 2.4 gig radios for a couple years. Can't say about other places.
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