Alternative tweeter

I would like to hear from any owner/user having replaced their VMPS 626Rs 'FST or Ribbon' tweeter with the Aurum Cantus " G2Si " ribbon tweeter, or any other possible alternative that garnered good results. I am a novice in the audio field looking at all feasible replacement for a pair of non-working tweeters. Any and all input is kindly appreciated, thank you.