I do like Tailfin, the frame (I have alloy) fits lots of frames, I have quick release. The pack doesn’t even feel like it’s on the bike as it’s solid mounted yet quick release. It’s certainly waterproof and spacious for stuff. I don’t yet have the side planners but maybe that’s an option for the future. I use small alternative supplier panniers for now. I do recommend this pack amd the build is really well made.
The frame mount with quick release is great for its easy on/off, and is super stable. I love the versatility of the system, allowing me to use on multiple bikes.
The Tailfin S Series is incredibly easy to install, and I'm amazed at how strong this thing is considering how light even the Aluminum version is. I would say I want one for each bike, but it's so easy to move back and forth that there is no need!