Have the classic version that takes AA batteries. Yes it's a bit heavier, but I don't like odd batteries.
Bought mine used off Ebay a couple of years ago. Loved using it, but on my most recent outing it failed to work. (Even with fresh batteries.) I always travel with iodine tablets as a backup.
I will probably buy another one, but I would think of traveling without a back up plan. (For me, iodine tablets.)