I had one in .40 SW when I was posted in Fort Lewis, WA. Ten round magazines and it WAS extremely accurate (as well as reliable!). I managed to take my wife (then) out on her 37th birthday to an indoor handgun range in Tacoma (Bulls Eye Shooting) WA. She had never fired a gun in her life but was ready to shoot one and it was the Browning Hi Power in .40 SW.
She pointed the gun at the target and I noticed she closed both eyes before firing it. Oh well that isn't a good habit to develop I know but to this date the only handgun or gun she ever fired was that Hi Power in .40 SW.
She didn't like the recoil or the noise (we had ear protection and safety glasses of course).
I later sold that fine Hi Power because to me if it was going to be a Hi Power it had to be in the 9mm for classic reasons as well as balance.
The extra 3 rounds to me add a little frosting on the cake. I think the argument between 9mm, .40SW, and .45 ACP in an auto is best solved by a man or woman's preference rather than picking one round over the other because it is heavier or what have you.
Today all three choices (9mm, .40, .45) are actually good choices to me.
My first choice in a handgun would be the Hi Power for a sidearm of semi auto function. The Hi Power in the classic sense is in 9mm. I think 9mm is a good "social" choice for anyone using or needing a sidearm.
I loved watching the video and think the host did an excellent job ringing the right tunes about the Hi Power!