After months of planning we decided to install a 4400mm (or 4.4mtr) stacker sliding doors (with screens) which led on to our deck. Through a bit of research on the net we came across the Vantage brand & began our search around Campbelltown. Advantage Windows & Doors were the most competitively priced. Not only were we looking at cost but we also needed something durable & of exceptional quality. Everyone at Advantage were wonderful to deal with from the receptionist,sales reps & staff. The doors were to our specifications. They arrived exactly as timed, which was about 3-4weeks. Bob from Advantage came out to make sure our builder installed the door properly, as it was the first time our builder had installed a door of this length & width. Our builder had no problems installing the doors after that. Bob was wonderful to deal with & provided ongoing service throughout our purchase of the door, even if it seemed minor. A few things to remember are Advantage supplies only so you will need a builder to install. However, they are very informative throughout this process. Sliding stacker doors are cheaper than bi-fold. Sliding stacker doors can be fitted with stacker screens which makes the track slightly wider. Bi-folds can have a retractable screen but is more costly than the sliders. Finally, you pay for what you get & this is one of the best investments we've made on our home. Thanks Advantage!