BSI Basic doesn't include consumables like wipers or brake pads, right?
Previously my E84 X1 cost $170 in first year service and then $700 in second year. Third year is supposed to be the same as second. So assuming F20 is about the same then basically you are paying for 3 services upfront which you can include in your original car finance - if you are getting financing.
Otherwise it really depends on how many km you expect to do. If you do close to 60,000 over 3 years then you should get the value from the package otherwise you may not need to do 3 services in 3 years.