I use ridged airline and run a siphon through flex airline for small stuff and a self made 1/2 inch pvc home built siphon vacum for water changes and it has a razor blade attachment to scrape the glass.
All the ones I've ever seen are worthless. When I was working in a shop I always talked people out of buying them. Anyone that did buy them always ended up coming back complaining they couldn't get it to work, or if they did get it to work it didn't do anything worthwhile. Best to just use the old fashioned siphon
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