Yes, it is. I am of the opinion that collaborations should happen, especially where you are trying to find a good ground on writing styles. You want to have a better writing style to ensure that you grow as a writer, and linking up with other writers is one sure way to make it happen.
It actually depends on what you are looking at getting from the collaboration you are going to start with some other writers because when the teaming up is going to give you something that you don't already know, it is something that is going to be of a very good advantage to you. Pick the best writers for your collaboration because that's the best way to get what you're looking for.