Personally, I like it so much I cant fly without it - going back to the hat switch just feels so clunky and slow. Imo, it allows you to track multiple cons easily - however, when you get into a big big furball - you really really need an aggressive profile to keep an eye on things. You can modify your profile easily enough, and you can use others as well.
On the downside - it takes a while to get used to it. You will be amazed how much you move around when you are flying, and even more so when you are fighting. Your aim will drop off (you wont be looking directly at the gunsite, and it'll move out of view etc). Initially you may also find that you track your opponent much easier, but you'll lose the easy eye on alt etc.
You will also look like a twonk when you use it (as my wife reliably informed me...lol...)
Different strokes for different folks n all that, but I love it.
HTH,
Wurzel