>>3891953They're basically good for two things
1.) straightening vertical lines when shot from ground level without having to use use post-production corrections which can stretch pixels and hurt image quality
2.) Getting everything in focus without having to stop down and introduce diffraction, which hurts image sharpness
You really have to decide if it's your thing or not. Most of those lenses are very expensive, they're also manual focus only and basically impossible to use handheld. I would try shooting with your current lens(es) more and figuring out if you really, really want the features mentioned above. You can get an ultra wide angle (like a 14-24 or so focal range) and shoot really wide in order to get buildings and rooms straight. And you could use the same lens to do focus stacking to get things in focus from a close foreground all the way to a distant background in a landscape. And the ultra wide zooms cost as much as a single T/S lens from Canon or Nikon, while being far more versatile in a lot of ways (usable handheld, wider aperture, autofocus included). It's up to you, but those lenses are so specialized and while it sounds nice to have what they offer, you really gotta think over whether or not you need them enough to justify the high price vs limited usability. If you shoot those subjects constantly then go for it.
