I buy the best display, keyboard/mouse, and printer I can afford (all of which should outlast several computers), then pair them with the best PC I can buy for under $500 (under $700 for laptops).. The diNovo Edge is the most expensive keyboard I've ever owned (by about $150!), but it's well worth it, despite a few drawbacks that really should never have made it into production.
Here's a quick summary: Beautiful design; Insanely great battery life; Very nice feel for a low-profile keyboard; Good range and reliability; LED lighting and touch slider for volume are great.
The compact design is great! It's FAR preferable to wider keyboards with number pads I never use. I use Excel and other computation programs a lot, but as an engineer and a road warrior who also uses laptops (I use this keyboard for both), I never use a number pad. Also, I REALLY like having the typing part of the keyboard directly in front of me, something that's really awkward if you're right-handed and have a keyboard with a keypad. (One more reason I hate these new wide-screen laptops with numeric keypads!)
There are two real problems with the keyboard: First, the touchpad works well for pointing, but it's maddening for scrolling, which is the probably the most frequent UI action in today's web-world. A regular rectangular Synaptics touchpad placed below the space bar, with a scrolling area on the right like Gateway uses on their laptops would be a HUGE improvement. At the very least, add another touch sensitive area just for scrolling - perhaps next to the volume control, with a tactile cue to let you easily find either one without looking. Also, the touchpad can get cranky if there's another similar touchdisk connected to the PC, like the one in the Wacom Bamboo tablet, which I use with this keyboard.
Second, the brushed aluminum trim piece at he bottom of the keyboard is beautiful, but surprisingly darn cold when you put your hands on it - enough to be beyond uncomfortable and into really annoying or borderline painful - and I'm not a cold-natured person. I'm thinking of replacing mine with a varnished wood veneer piece, and perhaps Logitech should consider the same thing, or perhaps shield the aluminum with a clear insulating layer. This is a much bigger problem than it sounds like, especially in the Winter, and even in Austin. (Another reason to be glad I don't live up North!)
Lastly, a couple of nits: The addition of a "back button" (or a custom button mappable to the browser's back button) next to the touchpad would be great - the thumb button is mapped to this on my mouse, and I use it all the time. Also, the Control/Alt/etc. keys are a bit too tall, but then the left Control key isn't next to the "A" like us Unix guys know it should be. Also, I had no idea that button on the left side with the cursor arrow was another left mouse button until I read another review here. It would be far more useful with a small tactile dot to let you find it by feel when holding the keyboard in your lap on the sofa. I'm still not sure what the Windows button above the volume slider is supposed to do either - it certainly does nothing for me...
Overall, I'm very happy, but Logitech let style trump good design and function just a bit too much. With a better touchpad (or at least better scrolling) and a fix for the palmrest deep-freeze, this would be a near-perfect keyboard. In spite of these flaws, for me, the diNovo Edge is by far the best keyboard available today, even considering its high price. Here's hoping Logitech reads this and fixes these problems to make what I (and I'm sure many others) would consider the perfect keyboard.
Technical Expertise: Tech Savvy
I've used this product: More than a year