I haven't used them, but did look them up to see what they were.
Here's what I would say based on what I saw:
They are probably an OK substitute for straps.
They are likely not as good a substitute for a good pair of wrist wraps.
If you and your brother are relatively new to lifting and aren't using huge poundages, they would probably be fine. If you need alot of support for pressing movements, I would go with a regular wrist wrap. You could use these as a starting point and get some better wraps down the road as you get stronger.