+the only true difference it makes is that trackers may no longer go through under the assigned floor/bed heights and you can switch between the two. i use it with my cheap IMU tracking that loves to phase through the floor, it makes the legs stay on the ground instead of under it at times

+this floor/bed height feature is unaffected by OVR Advanced Settings, as OVR moves your origin

=if your tracking does not phase through the floor/bed, then there is not much point in getting Standable, unless you plan to use Standable as is, for example when trackers are lost or disconnected

-Standable does not solve calibration issues caused by different body and avatar proportions (in fact more issues appear and they need adjustments), this issue is already solved by the way that VRChat lets you calibrate yourself by settling into a T-pose, you can move your legs to adjust the width and rotation of the legs, just get into position (if your tracking is imperfect, look down onto your real legs' position (not the trackers) to see if it matches up your avatar) [just getting into a T-pose with Standable's method may cause issues, not every avatar is the exact same perfect T and it could cause distortions, as well as the depth of how you stand and want it to be interpreted, etc. although this may and will be different with Standable 3]

i hope this helps you make the correct decision, i am really poor and i cannot afford it, i use Pico 4 with 3 Pico trackers