I have not tested a t430 but the t450 feeled a lot more "mushy" or rubberdome like. The t420 has a solid click (without the "click" :/) which is something i rea

I have not tested a t430 but the t450 feeled a lot more "mushy" or rubberdome like. The t420 has a solid click (without the "click" :/) which is something i really like. From what ive read it got worse after the t420. So it was a easy choice for me.