We did use team speak couple years ago but we don't use for now. I personally train every members how to control map well. So it's unnecessary to use vent/ts to tell where enemy is.
Tips:
1. open console and type "overview_names 1", now your minimap will show all your teammates names.
2. Bind a key to "toggle full screen map", I got "V" key bind.
Use cases:
1. When I play sniper class, my top priority is to kill mg. If any mg killed our teammate, I will instantly hit V and then I would see where that mg is.
2. When I'm waiting re-spawn, I always hold "v" to see map status. Keep doing so will let you know where needs support.
3. You will learn how to get the best timing to capture flag.
It takes time to get used to "overview_names 1", but its really helpful.
Also all of my members using pro gaming gears, includes the girl N@na, she got Zowie EC2 gaming mouse.
Here is my gears: (yes, I use laptop for dod gaming)