Looks like the wait for 6.0 is over!

upgrading my NAS now, I use mainly Sabnzbd, media server and Surveillance Station so will let you know of any issues.

Please post back with your results!

https://www.synology.com/en-uk/releaseNote/DS415+

EDIT: Already came across my first issue - after the upgrade it installed PHP and Backup software which I didn't have installed originally! - removed them and now going through the apps.

Better check here first chaps: https://forum.synology.com/enu/viewtopic.php?f=260&t=115982&p=424304#p424304

I have an issue with sabnzbd reporting WARNING: unzip binary... NOT found!, but other than that seems all ok for now.

EDIT: Sabnzbd seems to be working fine despite the error lol