BT Voyager 2091 Wireless router firmware question

[Bony Maloney]

There is a firmware upgrade for this router. Is it advisable to upgrade or only do this if I have problems. Disc drive firmware (dvd/cd etc) I have always upgraded to the latest firmware as a habit, I've never done a router before.
I am currently using firmware version:2.21.05.08m-A2pD018C1.d16d.
Thanks Paul