First of all, we are sorry for the delay answering your post.
Considering both systems, the bottleneck can be as you described in your post. Additionally, there may be other limitations such as network protocol, network topology or even the performance of the client machine.
There are many factors which can affect the performance.
So, answering your question. JovianDSS is not limited to the mentioned performance, or IOPS. It all depends on hardware, configuration and type of purpose.
If you are interested in JovianDSS i suggest to download our JovianDSS 60 days Trial version for testing purposes. Our pre-sales team will be happy to help you on every stage of the setup.
T-Ku, I'm already using 4x JDSS system in a virtual lab: metro-cluster pair and a pair for async replication. The trial will invalidated soon, but the 1 hour uptime will be enough to check something quickly. Great thanks!