I have 40K miles on mine and the tensioner is doing fine and has never been removed. There's plenty of these bikes that have seen over 100K miles, a few with >200K and at least one with >300K that have never had a tensioner failure. OTOH, a few have been known to fail. Most will let you know with funny noises that they aren't happy. Most of the ones that fail give up when the engine is abruptly shut down from high rpm - like in drag racing. It's in these applications where a manual one is most popular.
A manual one like your link will solve the problem, but you'll have to stay on top of it's adjustment when you do your valve adjustment checks.