There's something I just don't quite trust yet about the Browns... though people were saying the same thing about the Pats in the early 2000's before it finally sunk in that they were for real now. Still, I'm wary of teams that are historically bad then have a "breakout" year. Even if they continue to trend upwards, they tend to have a down year first while they acclimate to having more attention paid to them. Any team can put in the work and stay motivated for a season when they're getting a taste of success for the first time. Once you realize you have to put in that same work (and more) EVERY year, some of those guys get weeded out.
They're a great young team. Let's see them put two years in a row together and then I'm all in.