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My 172 has Apex spine smashers, A539's and a Sparco front strut brace. The turn in and grip is fantastic in comparison to standard. As a singular mod', you would struggle to see a gain but cumulatively, with other mods', they work IMO.
If its fitted properly to the actual suspension struts as apposed to the bodywork then you will notice a change/ feel cornering at higher speeds, but in-town driving, don't expect miracles.. They look fab under the bonnet though