TK820 hits and misses in key areas
TL;DR: Nice design, good range, expensive feel but a huge miss in "key" areas, due to the lack of a ins/del/home/end/pgup/pgdn cluster.
I needed a keyboard for a media PC that is about 15feet from the sitting position. The bluetooth unified adapter works fantastic, and has yet to lose a connection. Very robust.
The keyboard's design is nice, but it feels like it's trying too hard. I would have preferred to have 2 mouse buttons and a scroll wheel, along with the neat forward/backward buttons most media-oriented mice have. This has them, but they take priority over the function keys (laptop style; you have to hold Fn to get a function key to perform its original function.... odd. It makes accessing low-level functions like entering the BIOS into a game of finger-twister). Also, look as I may, but this board completely lacks page up/down, home, end, insert, and delete functionality, which I REALLY would liked to have had, even if they were Fn-bound to the 4-way arrows (which they aren't.)
The board is sleek and thin (About 1cm at the thinnest, and about 5cm at the thickest portion, where the 4 "AA" batteries go. It is made mostly of a high-quality plastic/aluminum. The touchpad is needlessly large, and feels nice; like a cheap version of the ones found on MacBooks, it feels cool to the touch and is solid. The pad itself can be pressed down for a left-click, or the standard trackpad gestures to scroll, right-click, etc...
Personally, I would have scaled down the trackpad about 30%, added at least 4 mouse buttons (right, left, forward, backward), and also added the inert/delete/home/end/pgup/pgdn cluster. In the spare space to the left of the newly-scaled trackpad, I would have moved the media function keys to their own special and intuitive cluster, and restored the Function keys' functionality. Also, I'd include a toggle for a laptop-style numeric pad.
I can't comment on battery life, as I've only owned it for a couple of weeks. It goes into a seamless sleep-mode when not in use, and even offers an on/off switch right and up above the backspace key.
Verified purchase: YesCondition: Refurbished