FWIG, the reason good fences don't tend to be held in the back is that clamping both ends tends to skew the fence. It's really hard to avoid this, so the fences just clamp at the front.
I use featherboards, sometimes with quite a bit of down force, and have had no problems with a Beismeyer fence, either. It's sometimes hard to get a consistent dado depth any other way.
I have one of those "crappy" fences on an older Craftsman TS. My Fence does not lift at the back, and properly set up does not skew. Plus the fence is easy to make attachments for on the top and both sides.
Like everything else, keep the tracks clean and blow out the saw dust. At one point it did skew, so I used squares or metal rulers to be certain it was squared when locked down and it would cut things consistently. Yet there is a lot to be said about not following the fence past the point where the blade contacts the wood your cutting.
:-)
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