Ah, but those that have had problems sure wish they never went third party. There are quite a few that have had issues, but if you are savvy enough to hack around it, its not that big a deal.
Use something else, like CCC, to backup to third party devices. You can thank me later. There are a lot of vendors claiming TM compatibility, some work some not so much. I have had nothing but issues with Synology before I gave up on them. If TM backups are important to you, do it right.