I've always before gone for the cheapest colour duplex laser I could find - I realise my mistake now. And this is comparing to Canon and Samsung units.
The Brother is slightly more - but take it from me, being able to use compatible cartridges pays that back several fold (even the first set of carts!!!).
The Canon and Samsung units I've had (1 x Canon, 2 x Samsung) have all objected to compatible cartridges - and with a genuine set running at over £400 that is a severe pain in the backside!
This Brother not only did more pages on the supplied set, but it has (well, so far) taken the compatible carts (£80 for a set with an extra black) with no problems - OK I don't do photo quality printing but presentation work is perfect. It sits on an ethernet port on the router and is just "there". The Canon was so temperamental about the network connection that I had a backup USB cable when it just plain refused to print).
Duplex, booklet, all no problem - my wife has not complained about it (and that is praise indeed!).
My only bug bear (and this is being hyper critical) is that the remaining toner indicator on the printer isn't particularly accurate, and to print out the status page takes 3 pages (or maybe there is a way to only printer the toner status but I haven't found it yet). Also, if you let a toner get low to the point it refuses to print, then replacing the cart doesn't restart printing. There's a "hidden" reset menu which fixed it, but it had me worried for a while (Google it!)
Would I buy one again - for sure (hopefully I won't have to too soon), would I recommend to a friend (or anyone!) - again, for sure.