I paid $800 extra for the premium underlay. It was lucky I was home when being installed because I noticed the cheaper underlay was being put down. They admitted they had made a mistake and oops.. my underlay wasn’t in NZ - I was going to have to wait another week. We couldn’t live with all our furniture and bedding in the kitchen so my family was forced to move out. They reimbursed me a small amount which didn’t cover the expenses of one weeks unplanned accommodation. Paul was unapologetic and came up with excuses. If you use them be warned .. be home when it’s installed to make sure your getting the right product. I wouldn’t use Harrison’s again.