Is Plant Root Growing Box High Pressure Root Grafting Box Growing Breeding Case reliable?

I suppose they're easier to use than trying to wrap a piece of stem in a plastic bag containing some rooting material, which has to be taped in place and is quite fiddly. They're quite inexpensive to buy, but I can't see why the roots will form more quickly than they otherwise would. Rather depends what sort of plant you want to use them for - anything with woody stems that can be air layered would likely be suitable, if it's not possible to simply peg a shoot down into the soil or a small pot and leave it to root itself naturally, but in fact, most plants can be propagated from some type of cutting (soft, semi soft or hard wood cuttings) rather than air layering anyway.