I deal with the pix 501 and asa 5505 all the time in small business. Recently I've been looking into the integrated service routers. How do the asa 5505 and 871 ISR compare. Is the packet inspection on the asa better than the ISR? I know the ISR is less expensive and you don't have to worry about the maximum user lisence which is an advantage. What would be the advantage of using the ISR to connect a small office to the internet (DSL or Cable) instead of an asa 5505 - and vice versa? Thanks in advanced.