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Thos clamps are just standard quick grip clamps so fine for holding securely. Not sure if they'd be as good as a workmate for clamping something and planing the whole length as the workmate clamps are lower profile but you could always add some spacers to allow that.
It's a more stable structure and a bit heavier but doesn't have a bar at the bottom where you can put your foot to prevent wobbling. Don't really remember that being an issue when I've used it though.
Main reason I have it is that it folds up neater and fits in the cupboard under my stairs which means I actually use it as opposed to not bothering getting the workmate down from the loft and using garden furniture instead ... It's useful enough but nothing revolutionary compared to a workmate (although the quick clamps can make it a bit quicker than winding in and out).
@aggi or @mespilus re the workmate alternatives are the jaws and overall structure sufficient to plan wood?
In my case a c.30cm long peice of wood.
@jono84 what did you go with in the end? Sadly my dad's workmate now seems at the end of its life as I can't grip wood to plane. And unfortunately the cost of replacing the top makes repairing prohibitively expensive.