Originally Posted by Skylark
Thanks for that info. I'm going to order a K400 unless subsequent posts advise against it before I pull the trigger on my HTPC build in a week or so.
Be careful with the purchase. Logitech released a revision of the K400 (technically K400r) but it's still sold under K400 almost everywhere, including Amazon. From the Amazon comments, it looks like they're actually shipping the K400r but I bought it at a B&M store just to be sure. The K400r adds support for Windows 8 edge swipes, additional two-finger gestures, and might be necessary for the two-finger tap right-click.
It's overall a nice keyboard/touchpad combo. I thought the thing that would annoy me the most is the location of the right shift key (to the right of the up arrow) but actually the touchpad is what has annoyed me the most. It's not as good as a Synaptics touchpad as you might expect on a laptop. Two-finger tap to right-click doesn't work half of the time; if it doesn't work, the best way I've found to get it working is actually to move the cursor slightly with one finger and try again. At some point I run out of patience and just use the right-click button.
Tap and hold to drag doesn't work quite as well as on a Synaptics either. The drag starts not where your cursor is, but from where your cursor is after you start the drag motion. In other words, if you want to drag something to the right, start with your mouse cursor a little bit left of where you want to start the drag. It's pretty annoying actually. What I usually end up doing is making a perpendicular movement first, i.e. to drag something to the right I first start moving up or down then right so I don't need to start a bit to the left.
These drawbacks aren't necessarily major for use as an HTPC keyboard, and to be honest I haven't found anything better out there, so I would still recommend the K400r.