It depends on what your needs are. I have an X1, and like it a lot. I play a PSR740 one night a week, and I like it too. It sounds great, but not as great as the X1. It is easier to operate, has better DSP and E.Q., is easier to program, and MUCH easier to carry around.
It does not have Hard Drive, aftertouch, sampler, or the vast User Style Memory that the X1 has.
I could very well make a living with the PSR740, but to me the X1 was worth the difference in price. But then again, is it worth THREE TIMES as much? I doubt it. But it's deductible!
Don