3rd party non proprietary controllers are best for all elevator companies. All service tools are provided with FULL access. They provide technical support on software and provide all upgraded versions. Parts are easily ordered and replaced with no hurdles or surprises. And everyone pays the same price for parts, boards and software. The worldwide companies will tell you their controllers are non propriety but it’s really not true. Why open yourself up to any problems down the road or to be locked in to any one or group of companies. Go 3rd party non proprietary controllers. Watch out though as a last resort they will jack up the price of the 3rd party controller. Make sure you get quotes from independent companies as well.