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Honestly...I'm very impressed. I've used the other "Red brand" of parallel guides and these are on par. I had high hopes that these would be decent for the cheap price, they are excellent. After setup and calibration, I made several cuts at different widths and they all measured exact. The fit and finish isn't quite what the other brand is but is close enough for my needs and I think any woodworker would be satisfied with these guides. Fast repeatable cuts on sheet goods makes life easier when building cabinets. As far as holding up in the long run, I'm not worried at all. They fit together solidly and the stops are stout. I would highly recommend these to anyone that wants this convenience but can't justify the cost of other brands.
Just like the other bird brand only cheaper. Even more so when combined with a makpac. When you receive the cardboard box, throw it away but keep the foam insert. It fits perfectly in a makpac size 1 which can be had for 20€ or even 17€ on sale. For comparison, the original brand asks $400 for the parallel guide system in a cardboard box and $480 for the same system in a systainer.