It's fine, it does its job. It requires a strong press on the glass to stick, we're talking about amateur use

I bought it with fear due to the low price. I wanted to remove a balcony door with double glazing that was too heavy to change the rollers and it didn't give me a "hand". What can I say. Simply unbeatable. Small size, huge suction power, ergonomic handle. It was worth the money in the end.

I bought it for 60x120 tiles, but it doesn't work because it can only fit one hand. Essentially, it is small and requires effort to suction

Given that I only used them once and I have no point of comparison, I will only refer to what I used them for. I had to lift two old windows, each approximately 2x2 m, to change the wheels. The windows were very heavy and I bought 2 double suction cups that performed excellently.