For a tripped GFCI, dollars-to-donuts you had a leaky o-ring on your boiler, which was letting steam into the innards of your machine. The replacement parts can be acquired very cheaply and there are great YouTube videos on how to do the repairs.
With the BDB there are a couple of primary failures after a couple years (failed o-rings, pump or solenoid that needs replacement, new grouphead gasket), which have fortunately been well-documented in online forums and YouTube.
This pales compared to some machines though - I was recently reading about someone has a ‘60s Faema e61 that has made nearly 5 million coffees.
https://www.home-barista.com/advice/faema-e61-original-vinta...
In addition to being great and having features of more expensive machines it can be trivially modded for flow profiling. You can now do what decent/slayer/lever owners do and pressure profile. Ok maybe it doesn’t quite compare to those but they are a multiple of the price, and now you can do the coffee shots, turbo shots, blooming shots and all that fun stuff.
If mine breaks down and I’m not in the mood to spend $5k on a machine id get the dual boiler.
The BDB includes features that can cost literally 5X as much on Italian machines (stainless steel boilers, a preheating tube that pulls brew water through the steam boiler first, an electrically heated grouphead, etc.) but it still has fantastic temperature stability.