Honestly, you nailed it about seized shutoff valves—that’s a classic headache. I’ve seen plenty where the valve hasn’t budged in years and just crumbles when you try to turn it. Under-sink installs can get messy fast if your pipes are old or corroded, especially in tight spaces. Countertop filters are less invasive but yeah, all those adapters add up and sometimes don’t fit right on older faucets. Neither option is truly hassle-free, just depends what kind of hassle you want to deal with.
Honestly, I’d rather wrestle with a stubborn adapter than risk snapping off a corroded shutoff valve under the sink. Once you break that, you’re looking at a whole new set of problems—sometimes even a call to the plumber if you can’t get the water shut off upstream. Countertop filters might look clunky, but at least you’re not gambling with 30-year-old plumbing. If you’ve got newer pipes and valves, under-sink isn’t so bad, but in older places? I’d play it safe and stick with countertop, adapters and all.
I hear you on the risk with old valves—seen more than a few snap in my time, and it’s never a quick fix. That said, I’ve had countertop filters leak or get knocked loose by tenants, which can be its own headache. If you’re dealing with older plumbing, I’d agree: don’t mess with what you don’t have to. But if you know your shutoffs are solid, under-sink setups do look cleaner and keep things out of the way. Just depends how much you trust your pipes... and your tenants.
Had a countertop filter get knocked off by a kid once—water everywhere, total mess. Under-sink ones are cleaner, yeah, but I’ve had to replace a seized valve before and it turned into a full day job. Sometimes “less hassle” is just picking your poison.
Honestly, I get why folks lean toward countertop filters—they’re quick to hook up, no tools, and you can see if something’s leaking right away. But I’ve seen so many of those things get bumped or knocked off, especially with kids or pets around. Under-sink units take a bit more work upfront, yeah, and if your shutoff valves are old or corroded, it can get messy fast. Still, once they’re in, you pretty much forget about them until it’s time to swap the filter. I’d rather wrestle with a stubborn valve once than mop up water every month. Just me?