I' a grumpy 80 year old man, that worked in IT since 1969 as mainframe prototype tester; programmer; department manager and chief architect of a large European organization.
The good stuff: I'm a VBox user since 2009, my oldest VM is Windows XP installed and activated March 2010. It survived 2 VBox owners, 3 Desktops and 5 CPUs. I still use it a couple of times per week to play the wma copies of my CDs and LPs with WoW and TrueBass effect.
The bad stuff: If I enable 3D acceleration, Virtualbox crashes on all my Windows and Linux VMs at least since 7.1.4. I'm fed up with this error. For some Ubuntu VMs I even switched back to VBoxVGA, because of strange visual effects in VMSVGA. I noticed, that since 2010 after Oracle took over and especially after they started using the VMWare drivers, VBox step by step got more issues, that also took more and more time to get solved. Maybe Oracle should use a small part (say 0.001%) of that 500 Billion for AI to solve those driver issues in e.g. VirtualBox.
Maybe it would be good to support the new Linux Kernels somewhat faster too. Many persons like me, want to try out their latest distro release first in Virtualbox.
Virtualbox is clearly understaffed and as a result I'm starting to get 2nd thoughts about VMs.