They can be useful but often the cheap ones are not that good / fall apart. You can also just build your own with heavier wire like used in home wiring and some

They can be useful but often the cheap ones are not that good / fall apart. You can also just build your own with heavier wire like used in home wiring and some quality crocodile clips. Attach to a heavy base. I also recommend the blue tack on top of the crocodile clip positioners.