I had a regular SB for around 3 years. We had a lot of fun and explored many things sexually. If you break it down to hourly it was definitely value for money.
The main downside for me was that I spent so much time with her that it limited my punting with other girls.
Now without a SB Im finding I have more time to try a variety of different girls in massage shops.
They are both fun. I go through phases. Worst phase was at the beginning of this year I had an absolutely nympho and hot young SB, I was seeing her twice a week sometimes and I was going to 42G very often as well. That was too much. It came to a time for me that I got tired of my excesses and dialed way down. Happier now and still having fun but I have more balance now. Enjoy the variety