Not sure why people bother with these stans rims and their silly rim strips / tape etc.
Changing to any tubeless system is a pretty steep learning curve, UST or not.
Personally, I’ve had more problems getting tyres to seal with my gf’s Shimano UST wheelset than the Stans rims we have. Watch the video’s on the Stans site to make sure you install the yellow tape properly.
The Stans system is:
Cheaper and Lighter (especially when you add on the chunky rimstrip many tubeless rims require…this rimstrip can also make tight fitting tyres near impossible to mount as you can’t drop the bead into the rim to get extra slack)
Simpler
Uses standard spokes available everywhere (instead of a 3 month wait from Shimano, at which point you give up and fit an non-matching XTR spoke)
Uses standard hubs (so you don’t have to shell out a fortune for a Shimano freewheel thats only going to last 12 months)
Similarly, non UST tyres such as Bontys Tubeless Ready are cheaper and lighter as they use the sealant to make them non-porous, rather than heavier construction.