This was a second printer for me to replace an older HP model I had for years.
The white is quite attractive and makes a change v the normal black printer colour, but that's a minor point the performance is what really counts.
The HP is easy to set up simply pop the CD in and follow the instructions (which are very basic and hard to get wrong) I prefer a wired connection to the desktop but the wireless works very well on this (useful for other devices)
Onto the main printer itself on the top part there are a few buttons and a fairly small LCD which shows the wifi strength and no. of copies. The buttons let you control the wifi, power, and black/colour copy, as well as a low warning indicator for both cartridges.
My quick fire pros and cons.
+ Good print quality for both text and photos
+ Excellent bang per buck, low price
+ Built in wifi, connecting is easy and trouble free, also has Wireless Direct Printing (so you don't need to join the wifi network)
+ Apple AirPrint compatible
+ Fairly good build, easy to set up and use
+ Acceptable print speeds (it's no speed demon but fine for this price - around 7ppm at high quality faster draft)
+ Good instant scan quality (like a photocopier)
+ Ink carts are "not chipped" you can re-fill them
- Not so easy to scan books (could use a double hinge)
- Scan quality is good for documents, acceptable for photos (for photo scans a dedicated flatbed will do better)
- No slots for media cards, small mono LCD
Size is fairly compact at around 425 mm width and 306 mm depth. Input tray holds around 50-60 sheets of normal A4 paper
Front has an extendible output holder, above that you can flip down the cover to reveal the ink cartridges.
Despite being a lower cost printer HP have managed to deliver one that has very good print output both for text and photos, it's on a par with printers costing quite a lot more (but not up to the super fine quality of the officejet range not unexpected ). Text is very clean, crisp and impressive. Photo output is also good with lots of detail and good colour reproduction (watch your colour ink though for larger photos it will go down rapidly) For the low price getting wifi is a part of the appeal too.
Watch the ink use on wifi though people can get carried away so be sure to keep an eye on the kids (I've learnt this the hard way!)
Ink cartridges are the HP301 range which I have for other printers, they are quite low in cost (HP do a combo pack for black and colour) Do note if you are a heavier ink user then the 301XL carts whilst more expensive hold quite a lot more ink and are more cost effective longer term. HP unlike some other makers don't chip their carts (it will complain the ink is low), so you can re-fill them yourself and save a small fortune (don't throw the empty ones away either sell them or get them re-filled) The 2540 is better suited to users who are doing light to moderate home printing, there are better alternatives for small offices or heavy users.
Bar a few minor niggles this printer punches beyond it's price point and a very easy recommendation for those looking for max bang per buck, but with good print output.