Depends on both you and the sling...
No way I could ever use one (I tried several), I was mystified by friends who used them and raved about how easy they were... until I twigged, I'm hypermobile, so although "fit and healthy", my spine, pelvis and shoulders just couldn't cope with the stresses.
Similarly, people with baby car seats who actually carry the baby about in them! Any more than front door to car door would leave me with back pain for days!
Slings are not for everyone so YANBU.