The experience machine sounds like an attractive idea. However, in my opinion, the invention of the experience machine would be harmful to human society.
First of all, it cannot bring all the users a “lifetime of bliss.” The dilemma most likely to happen is that the user finds out that the experience is not as good as he thought before. However, no matter the users like it or not, the machine will run for two years. For some of the users, these periods become “lifetime of suffering.”
Second, people would lose their motivation in real life. Suppose the machines solves the first problem, since everything can be experienced without efforts, people will tend to rely on the machine to achieve what they want instead of chasing their goals in real life. Some people might say that virtual experiences actually gives them the motivation to achieve them in real life. However, compared with putting significant effort into chasing dreams for years, it is much easier for a person to plug into the machines.
Once people use the machine, they would tend to rely on it. Who would waste two years in a machine that provides only dreams? I guess most of them are people who are not satisfied with their life. Once they use the machine, they pay money, they wasted time, and they cannot obtain their jobs in real life. Since real-life is getting worse, the users will spend more time in the machine when they wake up. And this forms a loop.
If the experience machine is invented, it will become a product for people to escape the reality. I would suggest modifying the use time from two years to two hours so that people can explore different experiences without getting addicted to it.