Not that I know anything about it, but Sparkfun’s product page states, “Utilizing the L5 band, the NEO-F10N delivers improved performance under challenging urban environments. The L5 signals fall within the protected ARNS (aeronautical radio navigation service) frequency band, leading to less RF interference.”
GPS is already protected in the US (
https://www.fcc.gov/enforcement/areas/jammers); what more protection would you expect from using ARNS frequencies? And if you're messing with aeronautical signals (eg. air traffic control spoofing in Somaliland), what additional consequences might realistically befall you? I guess there may be some vague legal benefit to using an internationally protected band but it's not going to stop truckers and teenagers who want to interfere with automotive trackers (for example).
A big win from multi frequency is the ability to directly measure atmospheric effects rather than estimating them with a model. You'd be able to do that with classic C/A code on L1+L2 or L1+L5, if such a thing was defined. Alas, C/A was never specified for L2, but smart people were able to detect delay between the L1(Y) and L2(Y) codes, even if they couldn't decrypt it.