not 1/2 year.....it is 1 semester, ~3-4 months....There are 4 semester in a year (spring, summer, fall, winter). The fee depends on the number of lessons in the semester....
I think it is good for babies and it's good to let the baby start early. The exercise helps the babies to coordinate it's body and get acustom to different orientation and posture..etc should be good for development.
There are quite some repetition in the LittleGym, some parents finds it boring compared with other gym, but I think repetition is good for babies, especially when there are reasons behind those training.