Since when do we have to have 'experience' to answer questions?!
1. Well answered by
Paddy and provided for by Apple.
2. Extra costs, more desk space, possible second phone line or tying up the single line, SPAM faxes (yes, it's everywhere! And this way they actually cost
you in paper and toner/ink.
)
3. Usually more expensive than a simple FAX machine. CONs listed in #2. However, they are much more capable since they can print (usually on both sides at once) AND scan (even in color with a laser model). And they take up much less space than all the separate machines would.
4. Never used one. Depends on how they serve your outgoing and incoming FAXes. Many convert them to emails. Probably more expensive per message but
could be cheaper in the long run if you don't need the actual hardware in #2 or #3. And they certainly don't take up
any space in your room/desk (of course, you may want to print some of them so you'd still need a printer of some sort).