The Sylvania bulbs are fine by themselves. The problem is that they have a known issue which can cause them to lose messages being passed on from other zigbee devices, such as battery operated sensors. This seems most often to occur when the network is busy.
So it all depends on exactly what combination of devices you have in your house. If you use Z wave devices for anything battery operated, then you shouldn’t have a problem with them. But if you want to use zigbee battery operated devices, the Sylvania bulbs can actually create problems in your mesh, making it look like sensors are off-line or not responding when in fact they are, it’s just that the Sylvania bulbs are not passing the messages along. See the note in the official supportbase article:
https://support.smartthings.com/hc/en-us/articles/214191863-How-to-connect-SYLVANIA-Bulbs
So as long as you understand this limitation, there’s no problem with using them.
See the community FAQ for more details: ( this is a clickable link)
( I should also add that Osram/Sylvania uses different firmware for their US versus EU bulbs. The problem with dropped messages is a known problem with the US version. I honestly don’t know if it affects the EU version as well or not. )