Hi Waka,
I have four of these edge clamps which I bought for a particular task a while ago - to avoid using any pins to fix an oak lipping to an in-situ 3m run of bespoke worktop. Expensive, yes, but excellent kit which enabled me to achieve what I wanted, and very useful to have at hand since. The worktop would have cost me far more if I had contracted somebody to do it - and I have the satisfaction of having achieved it myself. As is often said, "when you have forgotten how much they cost, you still have the quality." So, FWIW, I don't regret buying them - same as other quality kit which doesn't get used every day but, oh, so useful when you do need it.
There are some other, cheaper types about but they look much inferior to the Besseys.
Cheers,
Trev.