Comment Re: Sounds like a great deal (Score 2) 87
We migrated ~50 VMs from esxi to proxmox. It required a downtime for every VM but it was quite painless otherwise - mount esxi as a storage and import machines from it. Apart from a couple of older Windows machines that did not boot (google error 0000007b and how to fix it), it went quite well. Newer Linux machines renamed network cards, this was also easy to fix, we needed to login there and install QEMU guest agent anyway. In terms of time spent I would estimate that for a day or so of time, otherwise it was just running and I had to check here and there on the progress while working on other stuff.