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thanks

No matter the suction cup, over time they will become useless and need replacing.

Cool looking but magnets are the way to go.

I'm not 100% convinced of that. Magnets are nicer, I'll agree, but for example. The suction cups that come with marine grazer, I've used one so far. That's multiple feedings over the last 9 months. I've never cleaned it up or anything, just jammed a new ring on it. I think, and it's just my thoughts, there are some that are a higher grade than others.
Worst case senario, you could always glue a few on if/when they stop working.

+1, no suction cup is going to hold up in a reef tank long term.

A marine grazer is also not cantilevered weight. The design is nice but I'd pay extra for magnets.

True, but considering buoyancy how much weight are you putting on these?
I've never had a frag rack sit in the display for long periods.

The racks are not that thick, you can easily take off the suction cups and add some reef safe earth magnets.