I would simply like to state the following. I have been a student of Tai Chi Chu'an for three years..(I know not a very long time), and have begun Training in Aikido for about 4 months now.
Part of what lead me to study Aikido is it's similarity in philosophy and style to Tai Chi Chu'an.
Although, obviously, there are differences....thus the two different arts....the similarities are many. The basic martial philosophy of push when pulled pull when pushed...use your "opponent's" energy against him..etc.
Just my thoughts for what they're worth.