I sat in one for 1yr ++ in finance (not insurance but those deskbound type) job. My boss was a generous man who take care of his cows (the team). You will not regret.
A generous boss in Germany allowed me to get this one: Stokke balans
Active sitting really makes a difference, never had any issues with arms or shoulders. Needs time to get used to it.
Then in 2000 it cost about SGD 1,200.