Roland Td-4 advice?

I recently bought the td-4s, and I am pretty happy with it. I now have some more money, so im not sure if i should keep the the td-4s or return it and buy a better set (probably the yamaha dtx550k) so then I wont have to upgrade as soon. What do you think?

How long have you had it?
I have the TD4SX and I added on an additional cymbal.
I only wish the diameter of the mesh pads was bigger and I could add more pads.
Do you want to expand or add different sounds?
I would love to have a TD20 but that is only a dream.
I guess we would like to know what your trying to accomplish or improve?
Pro or amateur?