I've had two tree saddles for about the past ten years. I have the deluxe leather one and the ambush saddle. I carry the ambush in a Badlands Ultra-Day pack. It carries everything I need from a saw, pruners, knee pads, woodpecker drill, Grade 8 bolts, etc. I can grab it and go.
I've killed quite a few deer out of mine. Shots to the left are the easiest, but you can back around the tree for other angles. I've taken deer straight down under me. Try that with a regular stand.
You must obtain the correct size. I had an extra large in the beginning and sent it back for a large. Fit is very important. The extra large wouldn't allow me to breath properly. The large is the ticket for me at 204 lbs.
I bought a rope which goes around the tree with a carabiner and it supports the saddle much better than the strap which comes with it. Very easy to use.
The woodpecker drill allows me to use the same holes in the tree each time I use it. The holes grow closed after each season. I use 3/8" six inch bolts in the holes I drill for climbing.
I can shoot my bows out of the saddle easier than out of a regular tree stand. I even got a coyote two years ago and it never knew I was just above it. I believe it to be the safest tree stand I've ever used.
Changing clothes? Well, you can put on or take off a jacket, but I've never tried coveralls or pants. Being able to lean out from the tree to take the shot is a huge advantage for me. It keeps everything lined up and seems so natural.
It's a learning curve getting use to the tree saddle. I believe if you're anything over 225 lbs, you won't like it as the climbing/drilling can be a workout. Good luck!