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As Tester suggests - much depends on the clamp, and what you're clamping it to.
The little Draper was bought to fasten to a hall of residence desk in the 80s, and it still sees frequent use, particularly where solder, paint or glue is involved.
I have a Record No.3 firmly bolted to a bench, but it's sometimes convenient to have other options, hence the other vice attached to a significant clamp.tldr; sometimes and probably.
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Are clamp-on vices worth it? Or do you always end up buying a bolt-on in the end?