Reply to Modding 2 PS2 controllers

I found this adaptor on Ebay which connects 2 x Playstation 2 controllers to one USB port. Apart from the fact that it can only be used up to Win XP, can anyone else see anything which would prevent me from using all the analogues and buttons on my old PS2 controllers?

http://cgi.ebay.co.uk/New-USB-Two-Po...item5191e4fffe

I'm counting 28 buttons and 8 analogues, am I right?