If you can go there, DO IT. The Klingbeils as people and the experience of going there are both amazing; we went there ourselves in the summer to have our kid's boots fitted. We had been wearing them, custom ordered from an approved fitter, before, but, this was the first time direct to the Klingbeils themselves.
Take her current boots so they can see how they are wearing/not wearing, by the way.
Anyways, the boots we got are the best fitting Klings we've ever had. They put some special features in that are not on the normal order form to accomodate some special needs on them. There is absolutely NO extra charge for any of the additional features; we have every imaginable bell and whistle you can have on these things. The family themselves are nice, helpful, and wonderful to deal with. You will enjoy the visit immensely, plus, you get to sign the famous chair
And, yes, it was $649 pre-tax for the boots, adult size. There is no difference for the different S1, S2 etc, it's a simply one-price policy regardless of the options or strength you get. Trust me ... I don't think there are any options we DIDN'T get, other than funky coloured leather or rhinestones