I felt the difference at the first corner I threw my car into after it was installed, turn in feels more confident and stable. But I definetely would stay away from adjustable and where possible (not applicapable to ZZ Corolla's) try and go for a three point bar that also bolts into the firewall ( I think rollaboy had one like this on his old car ). Torsional Rigidity is the benefit it brings and an adjustable bar will never be as rigid as a solid bar. But with that said, unless you're building a 300km/h track weapon, adjustable units would still bring benefits to Corolla's turn in, but a solid bar is always better.