Instead of telling you how we like this, let me put into a specific comparative context as we are from.
We have always used multifunction laser printers in the past. Each time when we needed to get a new printer, we debated over whether to stay with a multifunction or go with a dedicated printer plus a scanner. But every time we decided to go with the multifunction, until this time. We finally took a different route with this printer and Fujitsu ScanSnap S1500. A $675 combo, but we couldn't be happier with the choice. Here are some of the highlights.
(1) With the scanner and the printer being two separate units, you no longer worry about the issue of one bad part bringing down the entire machine. This actually happened every time in our case. The auto feeder of the multifunction would start to malfunctioning, and we were forced to abandon an otherwise fine printer.
(2) The availability of a second tray in addition to the primary tray and multipurpose tray is a great plus for any office. The typical scenario, when you print a report, you may sometimes want the first page to be using the official letterhead paper, and the rest on regular paper. The three tray combination is perfect for this. The first page comes from one tray, the body comes from the second tray, while the envelope is printed using the multipurpose tray, all semi-automatic without any hassle. In addition, if you handling multiple paper format such as US paper size and international A4 size, you can't exaggerate how helpful a multiple tray combination is. We never carefully thought about this detail (a rather large detail that is), but once we realize this, we can't believe that we lived with a printer that didn't have this capability (to be fair, I think some multifunctionals may have this ability).
(3) Much more compact and lighter than the multifunction. And looks much better as well, especially without the auto feeder on top of the printer.
(4) Not having a totally useless fax is a plus for us. We nearly never use fax anymore, and when we do, we use an Internet fax service. For this reason, the fax part of the multifunction has always been a distraction, to say the least. Because the Fax panel tends to occupy the most prominent and biggest portion of the user interface, it is not a small issue. And if you are a minimalist like some of us, merely realizing that you got a big useless chunk in your machine feels unhealthy.
(5) Perhaps the biggest advantage in our case is that we now have the beautiful Fujitsu ScanSnap S1500, which itself is a phenomenal office tool, putting any multifunctional to shame in the scanning department.
(6) The separate scanner plus the printer together actually works very well as a copier. This was one of the biggest concerns some had with going with separates, but it turned out not be a problem at all. The Fujitsu ScanSnap S1500 has a "Scan to Print" function that scans directly to the printer. It feels seamless, with an extra benefit of having a digital backup. However, because the separate document scanner does not have a flat bed, you cannot scan from book pages. I don't think there is even a workaround for this. For us it is not a problem because we only scan from loose paper documents. But it could be a problem for you.
Concerning the several complaints others raised about this printer, our experience is as follows:
(1) It isn't the quietest printer, but this is a lot quieter than the Brother multifunctional we had previously. One of things that this printer does much more reasonably than the multifunctional we had is that it turns to a quite sleep mode fairly shortly after you are done printing. The brother multifunction we had world stay in a very noisy mode for at least 15 min. Compared to that one, this printer is decidedly quiet.
(2) Envelopes do get pressed hard, but we didn't experience any creases. Please note that there is a back door which you can open so that the envelopes would come from there straight without being curved and turned back to the front. But even when we used the front outlet, the envelopes are OK (but not perfect because they do have an appearance of being pressed very hard).
(3) The printing of the first page isn't instant, but then again I have not seen a printer that starts up instantly. This one is fairly quick to warm up. It takes about 10 seconds to wake up and warm up and another 10 seconds to print the first page, and after that about 2-3 seconds per page. I think this is quite decent.
(4) We didn't try wireless network, but the wired network was absolutely easy. The network cable connects the printer to the router instead of a USB cable, and printer is on the network already without requiring any effort. You just need to install the driver on each PC you use to access the printer. I'll say it feels As simple as, if not even easier, than a USB set up.
(5) Adding the bottom tray caused a bit pause in our case as we thought it would be just as simple as placing the printer on top of the bottom tray, but it turned out that after you have assembled the two pieces physically (quite simple to do), you need to "add" the bottom tray in the software as well. A one-time exercise and quite simple once you realize it, but not a very intuitive one at all.