it should. all functions on arq-100 should work on buzz without any problems except rocket button which I believe works on 3900 only. that rocket button is just to clean/imrpove memory.
other big advantage of arq-100 is keyboard with air mouse. the way air mouse work is if you hold in your hand and press mouse button then mouse course can freely and quickly move anywhere on screen.
I will probably get one of those soon for my buzz 4900.