Is it worth switching from regular "rim brakes" to the new disk brakes?
It isn't wise to install disc brakes on a frame and fork that weren't designed to withstand the unique forces that disc brakes generate,  and you'll just damage your bike in the process.  

If your Haro does have disc brake mount tabs,  then you can install them but likely only with smaller disc rotors.  Remember that you'll have to get new wheels too,  which increases your total cost.  

Disc brakes are great for many riders,  but then again so are rim brakes.  Do you really need to switch?