I used to have only a Topre keyboard at work (and a Matias quiet pro). Originally I bought it because I work in an office with sometimes as much as 3 co-workers sitting in fairly close to me. Cherry MX switches were out of the question, even with 40 AL O-rings they were just too loud. My filcos had too much "rattle and ping" for me to feel comfortable using it in that environment.
At first I was just like "Cool, topre really is a lot more quiet", but after a while I started to feel like I just enjoyed typing in the Topre keyboard so much more than on the others that I decided to sell my MX boards and replace them with Topre. My girlfriend also appreciates that the keyboard is not as loud.
Long story short, I now use Topre both at home and at work. Specifically I am writing this on a 45g Realforce 87u.