Just installed the Speedball because... why not? Installation was only slightly harder than the standard Crack due to the limited room you have, but it was still relatively easy. What didn't work was the bottom mounting stand on the main motherboard. Where as the top one actually had a longer screw to screw into, the bottom one was flushed with the bolt. Needed to find another screw. Checked the original instructions to make sure I installed it properly to begin with and it seems like I did. Looks like a misstep somewhere.
As for the sound, I haven't tried it enough yet for any initial impressions.