Depends on your definition of value. Their quality and fit is exceptional, the stuff lasts forever, and customer service is awesome if there’s an issue. I’ve always worn team kit, mostly Castelli, and I think the price vs quality equation for Rapha is in line with any of the better brands. You get what you pay for.
I typically ride my old Castelli bibs on the trainer, but agree with others a good chamois is even more important indoors if you’re putting in a lot of hours.
Disclaimer: I’ve never bought Rapha but have a pair of thermal bibs and a wool cap my wife bought me years ago, and acquired a set of their Pro Team Aero Jersey and bibs from the NYC shop as partial payment for an overnight RCC cycling trip they organized to our farm. I needed some non team race kit anyway… The jersey is my favorite top ever but the newer chamois is a bit bulky for my tastes and the bib fit a bit larger than I prefer.