1. It's your bike so you can do anything that you want to with it. Might as well say it now - some people are going to criticize you no matter what you do or how fast or how slowly you ride. Do whatever you think is best for you and tell them to (shove) off.

2. Try the seat. If you decide that you like it - fine. If you don't like it you'll be no worse off than you are now - find another seat to try.