I have it! I took it from UPS this morning and just arrived to work. It didn't turn on during my way to work, must charge it. The L-button feels stuck, R-button feels nice and snappy. Worst part of the day is that 20 students are defending their bachelor degree, and I have to ask them boring questions, it will take 6 hours! And it started 3 minutes ago, I'm late.
I'm sure you know this by now, but the foam pads under the shoulder buttons tend to get dislodged during shipping, according to some customers. Just unscrew those four (?) screws holding the back panel on, and you'll see pretty clearly what's wrong with your shoulder button. Reseat the foam pad and it should be good to go.
This is assuming that the screw holding the shoulder button isn't overtightened. If it is, well... loosen it.