Welcome to the forum, and yes, the tower strut bar is functional and you can feel the difference in handling.
What brand or who makes the tower strut bar you are considering purchasing? Freedom Design is the best buy (lowest cost), but in general, all tower strut bars are equal in what they are designed to do. It's a matter of buying what you like or the design of the bar.
Warning: Do not buy the APC tower strut bar. It is junk. Here are 2 reviews on the APC tower strut bar:
http://ptenthusiasts.org/cgi-bin/rev...pl?apcstrutbar
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