As an open source rule engine and product suite, Drools is well suited for the small and middle scale business to manage and integrate the rules to build the rule-driven system which can process the business-critical data and events to produce the automated decision. It is better to use Drools in the well-secured environment (back-end behind the DMZ), not putting it on the customer-facing front or exposing it directly the to public where may bring direct security risk in the enterprise environment. Drools still needs a lot hardening on the security side.
FICO Blaze Advisor is suitable for cases where you have to deal with rules and where you want to customise the rules based on the business need then this product is very good to use. Also it provide easy deployment so, wherever there is frequent changes in deployment then this tool is good to use since it provides the direct deployment.
Fusion doesn't support persistence of working memory, which brings some extra high availability risk to our business.
Guvnor still has a lot room to be implemented, it is not so user-friendly for non-technical people, so a lot of business users complain it is hard to master.
Rule execution server doesn't even have JMX implemented, hard to be monitored.
Drools is still lacking support for key Web services standards.
Overall using FICO Blaze Advisor is good experience since change in any existing things were very easy in FICO Blaze Advisor, and I was easily able to make the change and deploy the things directly so that was real quick to check the things in the production, and this is the best point about FICO Blaze Advisor.
The IT department quickly adopted Drools as it is a very good java-based rule engine, which saves a lot of time to meet the project timeline and balanced our business requirements.
Recently we start considering the OpenRules, which may be more business user-friendly.
