Supco fin comb works great - on most coils
Your review: The metal fin comb is nicely made and comfortable to use, unlike some cheaper ones. The tips of the fin comb are easy to get into the core and the recommended "rocking motion" does work well at straightening out the fins.
Pros: Easy to handle and get onto the fins. Works well, even with heavily bent over fins. The metal teeth are very durable and stay straight, even after a lot of use.
Cons: Hard to use on high-efficiency condenser coils due to the metal tearing the cut fins instead of straightening them. Use a cheaper plastic one, but be prepared to replace the comb teeth often if you do.