Problems between S2member and your plugin

Hi I have read the online reviews about your great customer service. I really like what I have seen so far but... before I commit to the subscription I need to know that you work with membership plugins. I am using S2member to protect my content. Is your team familiar with this. I can not have your plug in updating and destroying my software. I am going to be charging thousands of dollars for my program. It has to be fool proof.