Kaleido is the quickest way to stand-up a permissioned Ethereum instance. The team has made is really easy to interact with the blockchain via a rich set of REST APIs, including deploying custom Solidity code and invoking it.
Kaleido also supports out of the box integrations with a number of other systems via their marketplace, so you can focus on solving your business problem, not infrastructure or security. Review collected by and hosted on G2.com.
As with any Blockchain as a Service, you do lose some control over configuration, topology and security. You also trade-off ease of use against centralisation. The Kaleido team is very impressive however and makes these trade-offs quite explicit and has mitigations for some. Review collected by and hosted on G2.com.
