My Visico has those corners but I still like the Quick Ring for the octa because I find it way (waaaaaaaay) easier to set up. When taking down, yes it takes about the same amount of time.
As for my strip, it's about the same setting up and taking down between the corner release and Quick Ring. I know I could have bought a standard speed ring for the strip box but the price for the good ones are about the same as a Quick Ring or way more. The cheap eBay that it came with is really heavy and can't grip the insert for sh*t. It would spin at the slightest touch or when moving the strobe/rig. Imagine a strip box that constantly spins on your strobe. Lol. It's weird how there's a thing that keeps the screw from holding down the insert all the way, no matter how much I tighten it.
I'm not saying a Quick Ring is a must have, but for my use, and I've computed the amount I would need to spend (only the Lastolite and Interfit are cheaper), a Quick Ring and an SP Elinchrom insert is priced decently and a better choice. If I decided to be cheap and save $5-15 and got the Lastolite or Interfit and then find out they're too big for the rods or too small, I would have been screwed. I decided not to risk it and just pick up Quick Rings since Rob, Dave and others have already proven they work for Chinese, eBay and Visico boxes.
Besides, I plan on getting one for each strobe. That way, any future softbox/octa/strip I buy can be set up quickly on each strobe and I can just toss the el cheapo eBay ones they come with in my closet.