Same here: Leap 42 -> 15.4 . Never had any upgrade issues. Will move to 15.5 imminently.
However 15.6 will be the last release of Leap as we know it.
>openSUSE Leap 15.6 Now Planned To Provide More Time For ALP
A real shame about the timing too. I understand the general reasoning behind it (it sounds like SUSE internally is moving more towards the container/MicroOS focus) but making such destabilizing changes right when people are really looking for RHEL/CentOS alternatives feels like such a missed opportunity.
I tried tumbleweed after hearing much about it being stable.
Turned out, the swaywm package was broken, and I saw a post from someone that it had broken several times in the past few months.
I know it is not exactly a "common" package, but Manjaro has been far more stable for me than that experience was, even on lesser-used packages.
I am not sure if I benefit in any way from Leap and SLE having a shared code base, but I see no downside either. The version number of the kernel is a bit dated, but AFAIK, with enterprise distros that doesn't mean as much as it would otherwise. I have not noticed any features missing I wanted to have/use, let's put it that way.