> they use some networked block storage that's not yet supported on FreeBSD apparently
This may only apply to their physical offerings, not to the VM-based ones, and you may be able to get it to run using some nasty hacks (possibly involving loading your kernel after booting theirs). Either way, there are no official FreeBSD images so you'd be on your own.
Their IPv6 support is indeed lacking (one address, and you lose it if you stop the server).
"FreeBSD on x86_64 (C2S, C2M, C2L, VC1S, VC1M, VC1L) needs an alternative way to store data or an NBD driver for FreeBSD, and more work on the boot system"
This may only apply to their physical offerings, not to the VM-based ones, and you may be able to get it to run using some nasty hacks (possibly involving loading your kernel after booting theirs). Either way, there are no official FreeBSD images so you'd be on your own.
Their IPv6 support is indeed lacking (one address, and you lose it if you stop the server).