I've been using Bamboo for nearly a year. My company isn't using every single feature that Bamboo offers, but the features that our company uses now are great.
For me, a simple user interface is the most important aspect of any platform and Bamboo delivers that. I was actually out of the office during our internal Bamboo training sessions, but I was able to figure out the platform myself.
We also use Bamboo for new hire onboarding and Bamboo has automated triggers that are delivered in the form of an email to all the process stakeholders. We were previously sending emails manually prior to using this feature, and as you can imagine, things always slipped through the cracks.
Bamboo absolutely nailed basic features like requesting/approving time off, seeing who's out of office and employee work anniversaries. I also like the performance review, hiring, and company directory pieces of this software. Again, easy to use and has all the features you would expect from a world class HRIS. Bamboo can also be deployed internationally which our previous HRIS, Paycom, couldn't do.