If you have little space then definately go for it.
I have a Lexmark X83. I find it very capable all-in-one. Prints are very speedy and the option of photocopying without the PC on is exellent.
Having everything in one bundle just makes things alot easier. Only one USB cable saves USB ports. A scanner takening up a port is just waste if it isn't going to be used often.
However, Don't expect good photo quality results. I only use it for documents and the occassional graphic/picture so its perfect.
Another downside to it is the high cost of the cartridges. (About £35 each)
I have found other cheaper sources to buy from on the internet though.