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Hmm, it's gone up a bit since I bought mine.
Hard to quantify how much that extra 'feel' is worth. If you only used the turbo for sprinting intervals, I'd say don't bother with it, as the extra weight can cause a tiny bit more slippage under sudden starts*. It does feel more realistic though, which helps when you spend a lot of time training indoors.
*Not a problem with a direct trainer like the Lemond.
Do you have the larger flywheel attached to it? I found that improved the feel of the KK even more.