well the Track Ir 4 has an issue and that happened to my first Track Ir, luckily I used the guarantee.
I think that's the main problem you could find with a Track ir 4.
http://forum.naturalpoint.com/forum/...r=35004&page=1
Track ir 5 is more accurate and it has a wider range of capture
With Track Ir 5 you have to check just if it's not between two serial numbers.
The Track Ir 5 has less issues and is better obviously
