It's good. I'd say upper middle of the range. In my mind, it doesn't get much better than the DataON JBODs. They have a 60 bay JBOD. It's a wee bit pricey.
The SuperMicro chassis/JBOD is good if you don't need a highly available configuration. The SM JBOD only has 2 inputs and no user replaceable hotswap parts. The DataON have 2 card slots and redundant PSUs. Each card has two inputs and one output. This will allow you to plug in 2 head nodes for an HA configuration.