Not really a printer for casual home use, but for a business it's a very capable machine,
This review is from: HP Officejet Pro X451 Printer (Accessory)
We bought this for business use and it is perfect for that. It has been used to replace a laser printer, which by comparison was less economical and a general pain.
Very fast print speeds
Good quality printing
Starter ink cartridges lasted for ages (nearly a year!)
Paper drawer holds almost a full ream of a4 90gsm paper
High capacity carts really are high capacity 6,600 pages (manufacturer info)
Network admin page is good
Replacement ink is expensive - you're talking nearly £300 for a set of four high capacity cartridges
Not really suited to photo printing
I don't honestly think you can knock any points off because it isn't a multifunction printer - there's no scanning or copying - after all, it is marketed just as a fast and economical business printer - something it delivers very well.