I installed two, the BBSHD and BBS02 on used aluminium frames.
Both were an install and forget experience.
They are still running fine after a couple of years with no maintenance.
The first with a Stormey-Archer 3 speeds. The other with a 8sp drivetrain.
There are plenty of parts and accessories available on aliexpress.
I look forward someone ask me to build one on a carbon frame with their more recent versions.