[kevinrm]

From my experience, the bugs have been getting less and less as the versions progress. There were still quite a lot of bugs up to 5.2.10. There are still some but they seem to be manageable.

In our case the upgrades haven't really broken any of my custom mods except for one, and that was fixed rather expediently by the mod developer.

I've been upgrading since 5.0 but I only went live with it at 5.2.4, mistakenly assuming the cart was ready to be used for live commerce. It probably wasn't really ready until 5.2.10.

For sure - I won't be upgrading to 5.3 anything until I'm really sure it will be a smooth transition.