Kre - yeah- my view is that one of those won't do much, if anything for your handling. There are about 200 things that would do more for you.
Yosh -
1) I agree they give some feel w/ some cars (Hondas), they just aren't really designed to aid RWD applications. No idea about the hachi - he might have been confused or you might have misunderstood him - doesn't matter.
3) Well sure - you have a hatch! If you lost some weight and got some bracing back there like a coupe <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='

'> <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/hehe.gif" border="0" valign="absmiddle" alt=':hehe:'> you wouldn't feel it as much. I used to own a Civic hatch and that was the fouth most important susp. mod, imho (rear sway, shocks, springs, RSTB, FSTB, crazy stuff...).