So far, we have not had any issues and are happy with the product in general.

However, I wish I had cypher tools to inquiry like RDB SQL tools.

There are concerns about performance and whether the tool can necessarily scale to provide the solution.

There are things I found unintuitive or difficult to understand, however I can't say this is a deficiency in the product and likely more a function of my relatively low experience. I believe the best performance can be gained by building your logic in Java and interacting directly with their Java API, however this may be less of an issue with the stored procedure support coming in version 3.0.