I am using titan watches since last two years. Titan is a great brand for formal watches. I own watches from other brands too, like casio, timex, hmt, but when it comes to formal watches, Titan is my favorite.
My favorite collections are Titan Edge, Titan Clasique. I have three titan watches and I am going to add more to my collection. I dont really like Casual watches from titan. It feels great wearing titan watches. they are worth buying.