I've not had any problems with Rivnuts, I use a setting tool from Teng Tools, but I only tend to use them in low-stress applications.
![[Linked Image]](https://uktc.e2ecdn.uk/Products/ttnr81.jpg)
It works very well with aluminium rivets (which are all I use) but I suspect a beefier setup might be needed if one wanted to use steel rivets in higher-load installations