Before I started aikido, I had done wado-ryo karate for three years. Now I do silat and have just started judo.
Through all this I still prefer aikido, it feels so much more natural. Experience of a striking art was an advantage at first just in terms of awareness, but it was difficult to learn with an open mind. Plus all those isometric excercises I used to do made my joints really stiff and it was a painful first few months.