Great choice. It starts off pretty slow, yet gets a lot better once Rikiishi gets introduced. The only flaws I really found in the series were Joe seeming a bit too overpowered prior to meeting Rikiishi and the kid characters being annoying at times. There were a few other characters who didn't get much development, but they played their role in the story fine.
I'd also recommend checking out the anime after you finish the manga. The original anime has dubious animation quality due to it's age, yet it's soundtrack and voice acting provide a lot of weight along with the writing. The second season of the anime is even better than the manga in some areas such as the art being more refined and a filler episode managing to flesh out Carlos' character a lot more.