I would definitely check this out. I currently get larger bottles to refill smaller bottles of things like hand soap. It's less expensive too. I currently recycle as much plastic as I can. We do have a well for water so I put empty glass jars in the dishwasher so bugs don't get in my recycling. I find jams & jellys in pretty jars & then save the jars to put flowers in. We all have to get creative in recycling.
I've seen this in a second hand discount store before. I never used it but I would if the price is reasonable. The store I was in had name brand laundry detergent & yes, it was rather messy, detergent was running all down the side of the huge tanks that we're holding the detergent!
If it could save money and help reduce waste, it's a win win. Not sure what the odds are that I would remember to carry my empty detergent bottle back to a store with me, at least at first. Would need to be a clean process though.