It's an AWESOME lens...in fact, i can confidently say it is my FAVORITE lens (more so than the other L lenses I own). The only possible downside I could see to this lens is that it is a little on the heavy side, but I still lug it around everywhere because I love shooting with it.
As you also know, it is not an inexpensive lens, but you will likely keep it for several decades. There are tons of scammers out there. The basic rule of thumb of "If it seems to good to be true, it usually is" applies here. Sure you could save a couple bucks shopping around, but I don't think it pays to mess around with such a big purchase. I have bought several lenses and bodies from B and H Photo. They have excellent customer service and very prompt shipping.
As you also know, it is not an inexpensive lens, but you will likely keep it for several decades. There are tons of scammers out there. The basic rule of thumb of "If it seems to good to be true, it usually is" applies here. Sure you could save a couple bucks shopping around, but I don't think it pays to mess around with such a big purchase. I have bought several lenses and bodies from B and H Photo. They have excellent customer service and very prompt shipping.