I was waiting for someone to say that the best truing stand is your bike, flipped over

A quick Google search reveals that there's a review (from 2005) of the Minoura truing stand in this very forum!

I've used both of Park Tools' truing stands. The very inexpensive one-sided one is good enough to remove rim wobbles etc but not so good to actually center the rim on the hub. This is based on personal (noob wheelwright at that time) experience. YMMV.