[garganzol]

The amount of security weaknesses in Mikrotik is low and they get immediately patched. Those guys do excellent software updates and there are tons of resources to get help at.

Regarding the pay for a license to get the full functionality. There is no chance a home or ordinary office user will ever hit any limitations within a stock license. The upgrade might be needed only for the ultimate stuff in realm of BGP tunnels and stuff alike.