Mine arrived today. I swapped out some keycaps to give it a bit of interesting contrast.Wow, it looks very nice!
It's hard to get used to the placement of the delete and navigation keys though, since my muscle memory is based on TKL layout.
What are your thoughts on the placement of the FN key and its key-combo partners? At first glance, it seems like using "FN + Arrow Keys" or any of the other combinations might be a bit awkward, which is the only thing holding me back from buying this right now.
I personally dislike using Fn combos as compromise for missing keys, since they make it much more cumbersome to try to do additional combos that require one of the Fn combos as the base key. In the case of the FC680C, it's a lot better than keyboards with less keys (such as 60% keyboards), because you have alternative approaches to your navigation cluster. For example:
Fn + Arrow keys will give you Home/End and Pg UP/Down. This is identical to the FC660C.
The numpad with NumLock disabled will give you dedicated Home/End and Pg Up/Down keys. Since I have a dedicated numpad on the left side, I never use the numpad on the FC680C and always have the NumLock deactivated, so I can use the navigation keys.
The 4-key row above the numpad gives you dedicated Pg UP/Down keys, and Fn will turn them into Home/End. This is the one I dislike because the distance from Fn to those keys is too far and not comfortable to use at all. But since you have other options for those keys, it's not a big deal.
Other than Fn keys, what bothers me the most is the placement of the Delete keys (one above the numpad, and one at the bottom of the numpad), because neither one matches the position of a TKL layout, and while typing, my muscle memory of hitting the Delete key with my pinky is so ingrained that I just can't get used to the FC680C's Delete keys' positions, so every time I need to hit Delete, I have to pause and look down.
Another annoyance is the placement of the arrow keys. When using the mouse, my muscle memory makes me shift my right hand to the left to access the arrow cluster, but whenever I do that now, I end up at the numpad instead. I do like having the vertical enter key of the numpad there though, since it's much easier to hit than the normal enter key.
Truth is, if Leopold had a TKL version of their Topre keyboard, I'd have gotten that instead, but who knows if that'll ever happen, so I jumped on this just in case they'll never release a TKL version.