been diving for 9 years now and have always rented. Over the last few years i have only used steel HP100's or HP120's where ever i have gone. I have a yoke 1st stage (and have no plans of changing). I will be buying a worthington steel HP120 soon and wanted to get people's advice/take on getting a HP steel cylinder on a yoke 1st stage as opposed to DIN. Should i worry about this at all? Any advice offered is very much appreciated. Safe diving.