Flared out base flange gets in the way of pushing the plug flush against the adapter.
581914
As you can see, the base of the adapter flares out such that if you try to plug in something that has a large plug you can't seat the plug flush against the adapter.  It hits the flared out portion mounting the plug at an angle leaving a gap.
2479877
Overall it's a brilliantly designed adapter.  However, the detachable front cover that you slide in is very loose.  It just kind of sits in there and rattles around.  I had to put two pieces of black electrical tape on the ends of the cover so that it would have a more snug fit.
4181519
I like that it had multiple charging ports, but what I don't like is that the prongs are not centered, so it constantly falls out of the outlet no matter which direction I place it.  Annoying.
4513126
The outer perimeter is out of spec and won't fit in many sockets.
4601353
Nice split off. Plugs stays in tight. It's just a little bit too long
3444476
Just make sure your outlet plate is totally flush - otherwise you will have to get an outlet extender to clear the curves.
1623975
Works fine, but a lot of excess movement can cause the plugs to loosen/unscrew themselves. No problems at all if hooked up and left alone.
2980684
It works, but there is something rattling around the inside and the adapter has a hard time staying plugged into the wall in the outlets in Germany.  It just fit too loosely.  If I leaned something up against it, it worked fine.  I will be finding something a bit higher quality for my next trip.
3796267
Nice crapper however the bottom has a gap over the existing floor flange. Had to shim it up 1/3" and silicone caulk.
183853
the weight of the strip pulls it out of the plug if the plug is not flush with the wall or outlet you are trying to use. meh.
4735128
Doesn't fit snug against the wall so when you plug something in on the end of the strip the bar pivots and puts stress on the outlet.
656268
I have been frustrated by this product because the metal plugs are too short to hold the charger in position, often not making an electrical connection.  Unless the adapter is plugged into an outlet with the tines facing downward, it is likely to fall out of position.
2041048
Slightly out of standard spec in spacing between plugs and also of the two I bought, one has a loose grasp on the BNC connector.
3029173
It falls out of the wall if any pressure is put on it.  There should be a 'foot' on the end opposite the plug, so it will stay straight.
4088887
The plug openings are tight at first - just shove it in and pull it out a couple of times and it loosens up.  I hope no one takes that out of context.
928116
Part that attaches to the aux plug constantly comes loose resulting in a bad connection
4349664
The plug actually pushes itself out of most car outlets - springs at the wrong angle or something, but I have to constantly push it back in. At least it has blue LED lights that let me know when it's unplugged itself again...