This is a pretty old thread and the concern at that time was the legends were wearing prematurely on a batch of the OCN branded ducky boards at that time. It also seems that Ducky keycaps at that time were not PBT based purely on the early posts from 2+ years ago.
At any rate the model of ducky you're referencing is a full size model and if I'm seeing the right Leopold it's a mini which will be smaller than a TKL, and has a non standard spacing on some of the keys. What it's going to come down to is which layout/size is going to suit your needs best and realizing replacing the keycaps on the Leopold with aftermarket will be a bit tricky.
If you're looking for MX Greens CM has the QFR and XT, TKL and full size respectively, in Green. The possible downside there is no factory offered PBT keycaps. The other major difference between the CM Storm boards and the Ducky or Leopold is the fact is uses Costar stabilizers vs Cherry which a lot of people prefer but again a preference choice.
For me I'd go with the Ducky given those choice because I prefer full size keyboards to TKL and mini's at this time, though I have to admit I'm really loving the XT I got a few weeks ago.
At the end of the day what matters most to you in a keyboard after MX Greens? That answer might lead you to your next board. Happy hunting Edited by zflamewing - 11/26/13 at 2:20am