German quality
Upgradebality in one pump increments
2 year warranty
full self serviceable even down to the peri tubes and PCB's if you flood it
Availability of spares and service kits
Not Chinese
German quality (did I say that already?)
German pumps and motors
When you buy GHL you are buying a product for life not something you will have to landfill in 18 months+.
Look out tomorrow for the Mr Saltwater tank video review of the doser he gives them a massive thumbs up!
Basically you are buying into quality that will last and proven to last, I know many BM owner now using GHL after dealing with multiple motor failures and PCB drop outs.
Oh and BM actually do not make their doser, so not sure who puts their name to the quality control.