I was already on a regular SLR Gelflow and I transitioned to the SLR Lady Gelflow (with the ginormous cut-out... but I was really after the wider T shape) in the spring.

I sat on it and knew it was right, and just went for it.

As becky says, can you try it for a short ride first? If it feels better than the old saddle, which is hurting you, I'd say give it a try.

It also depends on the kind of time you think you'll spend in the saddle. If a metric century takes you 6 hours it's not the same as if it takes you 3 hours.