the "assistence-part" from the hydroboost is a bit better then normal vacuum brakes,and these are a perfect solution if your running a big cam in the engine that provides you little or no engine vacuum thats is being build up for the brakes.
then hydroboost is a great solution for it..
but if you have a normal cam and having no problems what so ever with braking, then i would really think about it to do it or not..
then the only upgrade would be that you dont have to press so hard on the brake pedal to get good braking..