I used one for a while to save getting my PCS10 out - but then acquired the Park PCS?? "industrial LBS model" having rearranged my workshop. The clamp etc is pretty much as good as the Park stand .. and it was pretty stable when bolted down to the bench.
Thanks for the suggestions. I only paid £20 for my pcs9 and my budget would not allow for a Park Tools bench mount but the cheaper alternative looks good and it is useful to know how it performed so thanks Rob.