Swiss Covered Bonds (Pfandbrief): Any thoughts?

So now this probably make more sense to investigate (YTM of 2% for 7y avg duration)

Anyone has experience with Pfandbrief? Seems like there’s no fund/etf available (there used to be an UBS one but it closed), but it should be tradable in 5k chunks on SIX. Anyone knows what the typical spread is?