Welcome to the group Michael! I have a Gem WK8 Megastation which I really enjoy. I guess the first thing that comes to mind when comparing it to the SD1 is the WK8 does not have a sampler. It can however, read samples from most major formats. The SD1 also has 76 keys where my WK8 only has 61. Others in the group are more up on the SD1 than I and may be able to provide a little more info.