I have one, if you do a lot of stuff that you need a ladder for this will do some things a normal extension or step ladder won't do. I have all three. I will use the step ladder or extension first. Lighter and easier to set up.
Figure out what you need it for, if you can only have one ladder, and you need to do a lot better of things with it, I guess it makes sense. Really depends on intended/anticipated use.
It is the only ladder I can use to make a scaffold to get to spaces above a stairway in my house, but getting on my roof, extension ladder, changing lights in the garage stepladder, just lighter and easier to set up quickly.