my neighbour has one.
He’s had it for 4 or 5 years now.
No major breakdowns as I recall. Service cost was OK at about £150, but the lad doing it did manage to spend most of the day doing it, which doesnt sound particularly profitable for them. A pro ought to be able to do it in a half day I guess.
As a boiler his has got a USB port. My boiler has a door where you put logs in and another door where you take ash out and that’s about it. It’s quite a “smart” machine and you can download and monitor all sorts of data if you want to.
His is installed without a buffer, although there is a standard HW tank in the house. It doesnt cycle as much as I thought it did. instead it seems run quite a lot through the day, possibly on fairly low fuelling rate.
His was expensive too, but it is MCS cert and so attracts RHI to cover most of the cost for the next 15yrs ish.
If you’ve ruled out Windhager, then Okofen are a good second choice IMO.