There are three tiers of jerseys, I order the middle ones. They're authentic except for the fight straps, which I have on the Charlestown Chiefs (from Slapshot) jersey I use when I play but I don't want them digging into my back on a regular basis.
The last time I ordered a jersey (two, actually), the NHL online shop sent it by next-day--once it was actually shipped. It took almost a month from my order before that point. I had no idea how long it took to put iron-on patches saying "Boogaard" and "Backstrom" on jersey blanks.