I had to leave so I thought I would finish . Most hobby woodworkers consider themselves lucky if they can get 4 hours a week in the shop. Some get more than others. I think Derick is a professional and if he is, he gets a lot of shop time, And what is cheap for a professional because time is money, is highly expensive for the hobbyist because that person may use a vise one hour a week. All of this should be taken into account when buying a vise.
I have a few more pictures but it all boils down to how much do you want to spend. The shoulder vise screw from Lee Valley is $46.90, while the one from BenchCrafted's is $515. I do not know the cost of the other two that were mentioned. Both install about the same so mounting is a wash. Any way both make great wagon vises. Does 30 seconds worth of speed warrant the cost difference.
Some have said one can get along without a vise by using holdfasts As I have tried to show there are several different ways of clamping so to each his own. As I have said I prefer a tail vise but a wagon vise is all but the next best thing and I wouldn't be with out one or the other.
So in the end the choice is in your hands so please let us know what you decide.
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No vises just holdfast and squeeze clamps