First of all, I didn't rate the Bonty system at all, mine worked but getting tyres off could be a nightmate- I found the tyre beads were able to get stuck down the side of the rim strip. It's really very similiar to the Stans strips, better but still a bodge IMO.
I've got Stans Flows and Mavic 819s, the Flows are tubeless ready not UST but it's a very different kettle of fish from the bontys- all you need to add is the yellow sticky tape and once fitted the wheel acts exactly like a UST rim. There's a minor issue that the tape can get damaged when changing tyres, though that seems rare- otherwise, using the "proper" UST 819s is just exactly the same as the Stans rims.
The Stans rims are enormously better than Mavic's tubeless offerings IMO... Mavic don't really seem to be trying to compete, the 819's heavier than the Flow despite being a closer match performance and strength wise to the Arch. There's nothing wrong with my 819s though, they're still decent kit.
Oh, I don't use UST tyres... Mostly my tyres are just standard, never had one that wouldn't work fine as tubeless. Some of them are tubeless ready- Specialized 2bliss and Bonty TLR- and they're a good compromise.
Seems to me that the heavy, tougher UST tyres are sort of the equivalent of a normal dualply, they have their place but they're probably not the first option for most riding.