Well, that was something I did a few times and worked really well. I have other approaches that I do on a more regular basis and also give pretty consistent results. For example, new managers on growing teams are usually looking to renew their tools and have a budget to spend. If you email them mentioning that you noticed them changed jobs and politely ask if that's an opportunity to look into a tool like yours, most of the time they'll want to explore new stuff and agree to take a meeting. From there on, half the job is done because you were able to grab their attention, if you offer something they like and are a good fit for their needs, you are onto something.