I have the Park PCS-1. So far I have only used it for general cleaning and lubing the chain as well as using it to store my bike when I'm not using it. When I'm doing maintenance, I clamp the bike to the seat post. When I store the bike I cradle the top tube in the clamp but don't clamp it down. One of the reasons I got this stand is that you can get a wheel truing attachment for around $30.
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Wish I didn't know now what I didn't know then. - Bob Seger