Not to necessarily justify the price of these, as value is subjective, but consider the following:
• It matches the Global knife design aesthetic and material. It will survive a fire, flood, tornado, earthquake, locusts, etc.
• The magnet is quite strong. Knives will only disengage with intentional force.
• Knife faces contact only the outer edges of the holder. It won't scratch or damage the face or the edge.
Placing knives on this holder is satisfying. The magnet grabs holds instantly, reliably, and securely, without any chance of slipping. Contact with just the tips is enough to hold 8" Globals. I've bumped aggressively into the handles of my knives on this holder by accident and they have never come close to falling off. I pack seven knives onto the 16", and it serves me well. It's worth the price to me because it works without any uncertaintly, it looks good and matches the Global knives, and I won't ever need to buy another unless I end up with more knives and space for the 20" or a second 16".
Most people will be served just fine by the $16 IKEA knife holder. If you're looking for a bargain, Global isn't your brand.