I've cleaned Windows for nearly 40 years and have used a variety of different methods. Leathers, scrims, blades and most recently as with many of us, wfp. During this time many customers have thanked me for my service. However, no customer that I can recall ever felt compelled to describe the finish left by my methods until I switched to wfp. Since then and without invitation from me, a number have used expressions like 'sparkle' 'shinier' 'extra clean' to describe the finish they see left by wfp. So I'm going to let my customers tell me what they think as regards the finish that Vision leaves. The jury is out on that one at the moment. I've only been using it at the recommended dilution for nearly two weeks as well, so it's early days yet.
I can't say I've noticed any significant change in the finish, but I have noticed a difference to the feel of my brush on the glass. It feels a little slicker somehow, though my brain tells me that something diluted in my water to that degree shouldn't be able to affect it noticeably.