If your doing light diy or decorating then OK, beyond that then nooooooooo !
Well you get what you pay for i guess. I found the plastic caps in the ends continually fall out and they're so lightweight are difficult to work with. I actually managed to bend the long one fairly easily rendering it useless.
I spent a little more and replaced it with a Stabila one, which is superior in every way.
The medium one I gave to my daughter as all she does is the occasional bit of decorating for which it is ideal. Squaring up wallpaper etc.
The small one I have kept as it may be usefull.
These were bought to repace much older ones and I think I've learned my lesson lol !!