I was stuck in the same quandary a while back, when a CC member advised me to get them, saying they might save a stroke or 2 a week. I had cred's aplenty to invested, and am glad I did.
Like any need club take a bit of getting used to (esp. the bs which I find easier to control with the RTX's) but once dialed in I do feel my results are slightly improved.
Worth the credits?? - Only you can decide, but they are an improvement over the CG's IMO
Thomas