My transition to electronic extemp has been a very rewarding and pleasant one. I concur with the others on this thread touting its manifold advantages. Electronic extemp is great for both small and large clubs.
The only caution I would have is to not be overly dependent on electronic extemp. There's no reason to not do both paper and electronic, because you might lose your computer, spill your Starbucks mocha frappuccino on it, or lose your boxes in transit (among other things). No harm is done if you have the hard copy paper backup to fall back on. Besides, some prospective extempers might not have their own laptop, so doing paper will encourage them to join and not feel like they HAVE to invest money into getting a new laptop if they don't really want to. But if you decide due to time, cost, and workability reasons to only do electronic, then that's fine - do what is best for you and your club.