What do you like best?
Open source is always the best way to go if you can. The freedom it provides allows you to tailor a more bespoke product that can help you stand out from the crowd. As VR is still up and coming, it is now becoming more and more accessible as a platform. This brings new tech and solutions, being able to try these and select the best one for your needs is invaluable. ApertusVR is well thought out and above all, stable and intuitive
What do you dislike?
It's not a pick up and play experience, and online help in the for of tutorial videos and even forums is limited. If you have some background in developing VR this will help massively, otherwise a complete beginner might want to look elsewhere.
Although very intuitive and stable once you get going, the bare bones nature for a new beginner can be quite daunting. Some example set ups or library management would aid this. For now this is on you to set up to you liking, which can also be a bonus if you have a clear methodology already in mind.
Recommendations to others considering the product
Feel free to try other alternatives, but this is a fair starting point into opensource VR, and will likely meet your needs
What business problems are you solving with the product? What benefits have you realized?
Open source all the way, it makes alot of sense business wise to have this freedom, especially for small teams or start ups. We would look at AR / VR solutions by breaking off small teams from the start of the game development pipeline while the main project was in later development. ApertusVR gave us a steady platform to integrate VR into our workflow, and determine if it made sense monetarily and as a business to persue this course of development