We will never endorse the use of any other reserve tandem canopy than the VR-360 in the Sigma/Micro Sigma tandem system for the following reasons. The specifics of Sigma/Micro Sigma tandem operation can be affected by many components. One example; our drogues are designed to be shorter than the canopy lines so when a reserve is deployed while the drogue is attached, the Kevlar bridle will not damage the deploying reserve. This is just one of many criteria that we have. The other side of the coin is that we have no control of any other manufacturer's product. Example; other reserves have blown up in the past from tandem terminal openings. Ours is designed to open at terminal, hence the deep brake settings. I personally know that there are some good tandem reserve canopies, but we cannot take responsibility for their products in the same way they will not do this for ours. When a change is made with regards to components, it is the responsibility of the users.
Because of the nature of Tandem jumping, the tandem is perceived as a system unlike sport containers. When something goes wrong with any component we are blamed or sued.