I use .lan and will continue to do so. .home.arpa is fine for 1 lan, but if you want to connect to multiple lans, it no longer works well. Add to the fact the amount of typing. .lan should be reserved so that people can use it for addressing multiple local area networks. We already have .local for mDNS which is perfect for the single lan setup. If they won't do it de jure, then users like myself will make this standard de facto.