Hey,
we've been very happy with the platform in general and I have implemented it at another place based on our success.
One thing I noticed though, is that issues marked as "false positive" on the server are showing up in the client as issues still, instead of being suppressed. This makes it a bit tough for pre-commit analysis as we get more and more false positives, because analysts will take time to work on issues that have already been marked as false positives.
There was a previous jira and this was fixed in
https://jira.sonarsource.com/browse/SONARCLIPS-281 but it appears to be back in 3.5 and in 3.4
I have tested this out in a couple of projects, with both plugins in mars, just version 3.4 of the plugin in juno and luna. Haven't tried kepler.
We are using sonar qube 5.1.2 with a fairly recent version (I think the previous to the current release) of the java plugin.
I can provide details about the particular rules if that might be the issue. We're using pmd, findbugs, checkstyle and the sonarjava rules.