yes
chassis rigidity is markedly improved. It isn't like new springs or a sway bar, but you will notice improved control and feel at turn in for virtually all corners. Plus, for $20-50, you can't go wrong. As for your next question: no - I don't see the reason in spending $100+ for one - Al is Al and a bar is a bar. I have the PDM bar and it provides a noticeable improvement (to me).
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