It's definitely perkworthy...
I checked earlier today, and it's got (in 1 day) 2000 kills to about 950 deaths. Now, of those, about 550+ were from GVs, so vs aircraft it's got better than a 4:1 kill ratio.
It's an instant ping killer. I was nowhere near one, took one ping, and my engine and oil were instantly dead. Too bad I was low and slow, so I make a gentle turn (my mistake here, I turned INTO the wirblewind!) and 2 seconds after losing my engine my tail was gone and some other parts and I was floating down to the ground in a fuselage with a pilot trapped inside.