The highback will have more response than the 390's because of the way it's designed. Stiffer on the out side of it towards your pinky toe, but softer on the inside. The heel strap is also going to be a bit more rigid. If you do go with the sweaters just check the screws on the high back there was a batch of those that were super problematic.
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Because someone has to call it how they see it!