Wolfram support

I was surprised by fast and friendly support that Wolfram offers to Mathematica users. The last two days I was bothering with a problem, which occurs when you try to calculate an alternating sum consisting of big numbers - the precision was not high enough and I always obtained a "noisy" curve instead of the smooth one. I played with accuracy and precision, but nothing helped. Finally, I've sent my notebook to Wolfram support, and have got an answer within a few hours, with a correct notebook attached. Now it seems to work - it is a bit tricky, though.