In the UK it’s probably just over 1.5 times the price, but you get a brass boiler instead of aluminium, the boiler is a bit bigger, you get a PID for temp stability, an easily adjustable over-pressure valve, a visible pressure guage, precision engineering (ECM I think) plus whatever else is good about it.
Possibly whittled out of the brick long after installation, by a bored funster, using a crude round-tipped tool ?