I like auto calibrations for what they are. They are not a perfect solution to the problems but they are definitely a helpful tool. Audyssey is a great tool especially for the basic settings, distance, trim, etc. But, as I've found out, you have to be careful and willing to try the calibration multiple times in order to get the right setting. A poorly done auto calibration, ie quick set up, quick location change, can affect the sound in a negative fashion, but on the other end, an auto calibration that has been carefully done can make a great impact on the system for the better.
As far as the SubEQ goes I've only heard the effects of it in a friend's set up and I was quite pleased with the changes that were made by the SubEQ. His room was relatively problematic and had some decent peaks that needed taming and the SubEQ did the trick.
I have still yet to hear the SVS unit, but I'm sure it's good too.