This [Debug Apex Code in Eclipse (Generally Available)](http://docs.releasenotes.salesforce.com/en-us/winter16/release-notes/rn_debugging_debugger.htm) release note says:

> 
> The Apex Debugger extends the Force.com IDE plug-in for Eclipse and
>  behaves similarly to debuggers available for other languages. Use it
>  in sandbox orgs to root out the bugs in your Apex code.
> 
> 
> 

I also see the PDF release notes say "Contact Salesforce to enable" and that additional cost is involved. Yo Force reports a cost of $18,000 a year in their answer.

**I'm looking for feedback from someone who has actually used the feature in their normal work.** How well does it work? Any gotchas? Has effective debugging support for Apex finally been delivered?

(Mention from earlier this year [Force.com IDE Debugger. New feature?](https://salesforce.stackexchange.com/questions/74003/force-com-ide-debugger-new-feature))