Removing Launchpad's "Mentoring" Feature.

This is a last call for user experience data with Launchpad’s “Mentoring” feature for bugs and blueprints.
We’ve seen only limited usage of this feature, and haven’t gotten much positive feedback on it. Right now, it’s dropped from our 3.0 redesign; but before 3.0 is finalized, we’re interested in hearing people’s experiences with mentoring.
If you’ve used the Mentoring feature, either as a mentor or a mentee, please leave your feedback as a comment here. We’re particularly interested in answers to these questions:
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Would you say that Mentoring caused any difference in the rate of resolution between mentored and non-mentored bugs? (It could be a positive or a negative difference; both are interesting to us.)
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For people who offered mentoring: in your experience, did you have responses on your mentoring offers? Were you successful in integrating the mentee’s changes?
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Do you have any thoughts on how to improve the feature?
Please note: this is about Launchpad’s specific implementation of Mentoring, not about mentoring features in the abstract. We’re interested in your experiences with what’s actually been available in Launchpad. If a few people found the Mentoring feature useful, but most who tried it did not, then we will probably leave it out of Launchpad 3.0. On the other hand, if we hear something very unexpected from the feedback, that could affect our decision of course.