Coming from a very "soft" style of Aikido, my first few seminars were quite scary. In fact they still can be. But I gained such a lot that now I travel around and visit as many dojo and as many different styles as I can. There's nothing more useful than getting some new light on something you though you knew.
At first I had doubts because I feared my own style would get "corrupted" by practicing with different styles, but now I know that isn't really an issue, as everybody gains from the exchange of views.