I use an FC660M at work, and a Poker X at home. The last is the previous version of the Poker 2, however this one does not have a plate, but I can comment on its layout.
FC660M:
Build: Very solid, high quality finish and the weight is in the heavy side for its size.
Layout: The perfect size for my use, I do some programming, writing and general surfing. I am a heavy user of excel for financial modeling and I prefer this layout to the Poker's. The arrows and the delete keys are always handy.
Feeling: Outstanding, high quality, nice sound.
Cons: The layout requires three special keys: 1u windows key, 2.25u right shift, and the main issue is its space bar does not have standard stem positions.
POKER X:
Poker X (Please be aware that this is not the same than the Poker 2, so I will just share my experience with the Layout.
Layout: It is ANSI standard, thus, you can use any MX set available. The keyboard looks very nice, exactly as if you have cut out from a full size one. The arrows are not a problem, after you get use to the FN+ combinations. The Poker X also has a mode to set the right modifiers and the right shift into an arrows set, but it also can use FN+WASD as arrows. I have found this very useful. The new Poker 2 can't use the right mods as arrows, which I regret, otherwise I may get a Poker 2 for the macros capability.
Cons: If it were the Poker 2 I may consider the lack of an arrows block over the right modifiers as a con. The Poker X is just perfect for me. I really do not need the macro capacity of the Poker 2, of course it may be handy.
Conclusion: I may had a hard time if I were in the case of decide between a Poker 2 and a Leopold FC660M. I think I may be more inclined to buy the Leopold, because I do not like the access of arrows on the Poker 2, however it is suppose you can set arrows in the PN layer at any place but on the right modifiers block, where is the natural position for my style of keyboard usage.
I hope this may add some value to the information you already have.