A broadsword is too large to use in one hand without special training; thus, it is an exotic weapon. However, it's not as long and heavy a bastard sword, so a charachter with 12 of strenght (instead of 13) can get the Exotic Weapon Proficiency feat for a broadsword suited for him. A character without the Exotic Weapon Proficiency feat can use a broadsword two-handed as a martial weapon, or one-handed with a penalty of -2.
Except With an extra requirement of +5 gp (for a total cost of 25, for medium characters) a Broadsword features a more elaborated cross-guard and balancing, so it allows the following property: except for proficiency, feats and abilities which effect the Longsword also effect the Broadsword (characters proficient with the Striscia are also proficient with the Rapier for purposes of any of the following feats: Greater Weapon Focus, Greater Weapon Specialization, Improved Critical, Weapon Focus, and Weapon Specialization).