It is my opinion that outside dawgs are not needed. One is good, two is redundant. What does it really do you for you? I do leave them on my big saw, but that's the exception.
The bars are lighter than your standard Oregon bar. The steel is also harder, which means less dressing and longer life. The white spots you see on the bars are actually plastic of some kind.
Yes it is possible to swing a tree 180 degrees. Its all about momentum. Its far easier to swing one 120 degrees however, and you better have a wedge handy in case you need to wedge it over onto your kicker or Dutchman, to start the tree around. The first thing you have to know though is where the tree actually leans, this is the part I see most people fail.
My opinion- I see a lot of posts here about kickers, Dutchmen, Coos Bay cuts, etc. While it is fun to talk about, I don't see the need for "trick" cuts in treework around buildings or other liabilities. When I cut around houses we straight fall, wedge, or most times pull, everything. I wouldn't dream of swinging a tree over a house when I can put a line in it. IMO these types of cuts are to save work in an area where shit going wrong won't hurt anything but your ego. YMMV