As an occasional Stern owner, the thing I am most concerned with it the availability of parts. There are tons of B/W parts on 10 different sites, with Major inventories - all because there are TONS of games out there still running, all using roughly the same parts. Stern has much lower production runs, and it would seem to me (I have no info on this one way or the other) that there would be less parts available as a result.
Add to that the dramatic changes in design from Whitestar to SAM to Spike and Spike 2, and the quantities are even lower for
Those specific boards. B/W had different sets of boards too, but fewer major changes between runs, and again the higher inventory.
This isn’t really Stern’s fault - they are running what the market demands, and their changes have reasonable business sense behind them, but as an owner, this is what always comes to mind first.