Well...being honest, I have 30-40 years of experience using a climber and only about 15 hunts in the LWCG stand so it still feels a little slower for me....I've not timed it yet but I'd guess that from walking up to the tree, stand and sticks on my back, until I am at hunting height with my bow and backpack on the hanger...I'd be at about 10-12 minutes and probably about the same time coming down to get everything packed up to walk out.
I tried saddle hunting last year and then bought the .5 this year....I prefer the .5 because I can actually stand and shoot almost 360 degrees on the platform without all the twisting / turning in the saddle....YMMV
I also tried "hybrid hunting" i.e. using my saddle with the .5....but since I like to actually stand so much, I prefer to use a rock climbing harness over my saddle in the .5 because the saddle sags when you just try to stand up whereas the RCH stays put.
For me, I really like the .5 with the XOP Holiday Harness and yes, I use a linemans belt climbing up and down and then a tether on the stand.
I'll also say that the .5 allows me to climb trees with a lot more cover than I ever could with my Viper....in Mississippi a few weeks ago I climbed a beautiful little white oak and was able to easily go above 3-4 limbs and it just felt awesome to have those limbs and cover below me.