I had a hydor inline heater on my canister, and it was one of the best heaters I ever had, it never let the temperature drop more than a degree from what it was set to.
So, as far as them being worth it, yes as long as you get a reputable brand, they are also favored for the reason that they aren't visible inside the tank.
I have a hydor on my canister (also a hydor) and it works great. keeps an extremely stable temperature and nothing is in the tank which is big plus for me.
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